4. GE offers two solutions: UL Type A and UL Type B. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current production options to choose from. 15 amps or 6. 00 plus shipping. European and 4 digit number to USA. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. $39. If one drills down deeper at TDSL by starting with the full equivalent variants such as the 12AU7A, 12AX7A, etc. Each "side" of the tube does a different job in the amp, like two separate tubes. This data is Oct 13, 2009 · As for the original question, tube rolling is equivalent to seeing what non-factory spec aftermarket part has what effect in hampering your high-end European sportscar to give it more "individual character. Other equivalent part numbers are ECC81, 6201, CV4024, and CV455. Performance should be identical to any equivalent 12AX7. Order toll free: 800. Many manufacturers produced plain 12AX7's well into the 60's and 70's, but I believe these are 12AX7A's marked 12AX7. Use if your looking for a very low noise pre amp. Factory selected for low noise and microphonics. Create your own unique tone and love your gear again! May 18, 2019 · Some people might worry about whether or not you can substitute the ECC83 for a 12Ax7. A cross refe JEMOSA Convert Tube Socket 807 FU7 FU-7 Vacuum Tube TO 6L6 KT88 Electronic Tube DIY Adapter Socket 1PC - $13. 5F6A major components: First tube the 12AY7/6072 preamp or the 12AX7 or 5751 voltage amp, Second and third tubes are 12AX7 drivers. The equivalent for 12AX7 IC are 12at7, 12au7, 5751, 7025. Rating: 100%. This data is "Ei-RC" - Electronic tubes factory Data Sheet EL84 Page 1 of 8 Telephone: +381 18 550 741 EL84 is A. WESTINGHOUSE 12AX7A ECC83 O 14mm. 7 pF Base standard 9-pin miniature, glass button Basing diagram JEDEC 9A If you really wanted that same 12AX7 tube to register above 100 units merit on an Eico 666 or 667 (full-scale is 140), you could also use the equivalent 1962 data setup chart from the Simpson Model 1000 tester (found at www. 2 and -16. It has three sets of RCA phono inputs with XLR connectors also available on one of the inputs. 85, Tung-Sol 12AX7 Preamp Vacuum Tube, Single - $16. Tube 12AD7 or Röhre 12AD7 ID5273, Double Triode, Noval, B9A and shown. Regular price $79. 12AX7 Family Tube Substitution. A. The 12ax7 can only be used in circuits where the heater circuit is wired in parallel, the 12ax7a can be used in series or parallel heater circuits. Graph Interpretation All 12AX7 tubes have an amplification factor (μ) of 100 ("high-mu"). The only place to shop for preamp tubes based on their sonic attributes. Equivalent input noise: -135dB average 10Hz-20kHz; Frequency response: 10Hz- 50kHz (-1dB) Signal to noise ratio: 115dB average 10Hz- 20kHz; THD + Noise: 0. I just went from a 12ax7 Tungsram ( and many other 12ax7's ) to a Sylvania 5751 3 mica black plate ( Yellow Label ) in my newly Upgraded Thor Audio Linestage and must say its the best 12ax7/5751 I have ever heard ( in my unit ). 50 £12. 12ax7/ecc83 svetlana 'winged c' boxed anode valve/tube. Tubes - 7025A Sovtek Equivalent for 12AX7 or 12AX7A Pre-Amp Tube . There are links to tables of equivalent of European and World War II military type numbers. All 12AX7 tubes have an amplification factor (μ) of 100 (" high-mu"). You will not have to worry about parallel vs. We carry all of the major brands in NOS, vintage and New Production vacuum tubes. 71 Re: Sophia tubes, they aren’t building the tubes in America, just designed them here and having them built in China. 5/5 19 reviews Write your review Item ID: TubeMPps $ 89. Contact Us. 12AX7A - Registered by RVC of Canada in 1958 An improved 12AX7 controlled for noise and hum. The Tube MP Studio V3 delivers warmth and fatness to any audio source while maintaining an exceptionally low-noise signal path. $17. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. Note: Product may vary from picture The Equivalent Input Noise (EIN) is -129dBu (A-weighted). 12AX7 tubes are known as ECC83S as well. Note that 2 12AX7A 3 1 S2 1 2 V2A 212AX7A 3 1 R19 130/1W 1 2 S1 SW 3POS 2 3 4 1 R16 1. It has two identical triodes both of which have a high voltage gain. Jul 16, 2020 · Re: EF804S vs 12AX7A Noise « Reply #6 on: January 12, 2005, 10:21:33 am » there is absoultely no comparison in terms of quality, noise, consistency of product (ef804s tubes came with a written warranty for every individual tube) in comparison to any 12ax7 or ecc83 or most audio tubes in general. Asking $225. If you have known brands and they test good you could probably sell them for decent money, especially if you can match them. Per RCA, the difference between a 12AX7A and a 7025 is that the 12AX7A is spec'd for an average value of noise, while the 7025 is spec'd for the same average value of noise (as a 12AX7A) AND a maximum allowable noise value Our 12AX7's provide the maximum level of high gain output and overall tonal quality with unsurpassed consistency and reliability. Among the best ever of the greyplates, for $5 more than the standard 12AX7A, the choice is obvious. Mullard CV4024 A 12AT7 equivalent that was made in the tens of thousands for UK military spares, probably to help keep the Mullard factory open. Average   12AX7 ECC83s 7025 JJ Electronics. Designed to fit in existing HID fixtures, GE's LED replacement lamps are a smart, efficient and long-lasting solution to replace traditional lighting. 6189W,and G. 6 Apr 2020 GT-12AX7-C Preamp Tube. Want to know and understand what each 12AX7 tubes characteristics are, This chart is a great way to see what brand provides the right amount of gain and how it may help you search for the right tone. Therefore you can use a tube that is not the equivalent of a race horse, and you don't need to spend that much on the tube. The voltage gains are thus -32. The company was acquired by Belton and continues to make high quality reverb tanks perfect for replacement or upgrade use. JJ Electronic 12AX7 twin triode 12AX7 also known as ECC83S or 7025. Steve 12AX7 CHINA * 1980s * SPECIAL 12AX7 * V1 - $14. Our tubes are always tested, matched and guaranteed. 7025/ECC83 equivalent ; Part Numbers; Pin Type Our Part Number UPC/EAN; Gold: T-12AX7-GOLD-TUNG: 841358101786: Regular: T-12AX7-TUNG: 683274020556: View Product The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 – same valve, just a different name. Active only when MORE / LESS switch is set to MORE. Out of 5 tubes, 2 12AT7's and 3 12AX7's, every single one was bad. Mike kc9nji Le Tube MP V3 est un pr amplificateur Micro, ligne et instrument a tube (12AX7A). In addition, one 6072 tube is needed at location V1. High-Mu Twin Triode. Chances are, you’re going to have a long wait to get to changing your tubes. 5F6A major components: First tube the 12AY7 preamp or the 12AX7 or 5751 voltage amp, Second and third tubes are 12AX7 drivers. 5500 Having used quite a few 12AU7 equivalent variant tubes These vintage 1960's organ grade reliable 12AU7 Baldwins are always a sweet smooth and quiet wonderful choice! A very favorite variant of the ECC82 / 12AU7 is the 5963 Other great 12AU7 types are JAN G. This 1932 RCA BELOW manual provides all the data sheet information, of the first radio receiving tubes ever made, from about 1920 to 1932. ” Military 12AX7 with just slightly lower gain than a 12AX7. 00 postage. Of course, the 12AX7 predates the invention by three years. That 12AX7A reference was a typo I meant to say 12AX7 originally. click & collect. The MP1100 Phono Preamplifier achieves our most accurate equalisation ever. 12AX7 CHINA * SPECIAL 12AX7 * V1 **** Special 12AX7 **** One (Gain Tested) Chinese 12AX7 Preamp Tube * This is a Premium 12AX7 that has been Selected/Tested for Medium/High- Gain and Low Noise + Has a Black Shrink-Wrap Band around the tube to Further Reduce Microphonics and Noise ** Highly Recommended for Any V1 Input stage where a Low-Noise Jun 09, 2020 · This is currently not exposed to the user but I've been contemplating adding it. Vacuum Tube Please contact us for equivalent replacement. The pure Class-A design using two discrete 12AX7A vacuum tubes to deliver controlled ‘musical sounding’ overload characteristics for added warmth and presence, while maintaining an incredible dynamic range with unsurpassed sonic detail and clarity. Muf. 7025 Tubes. Audio tubes for guitar amplifiers and audiophile equipment. All depends on the balance of your system. This addition is long overdue. org (or tubemuseum on eBay), Andy Baumann www 12AX7A Equivalent Sovtek Preamp Tube Model: 7025A. Bild 1: 12AX7 bzw. Without a thorough knowledge of tube types and their substitution possibilities, you may be over-paying for your new or NOS tubes you employ, or just pick the wrong ones. 00 Rca 12ax7a Vintage 1966 Nos Vacuum Tube Sleeve Tv-7d Tested Amperex 12ax7aecc83 - $459. The following should be direct substitutions. 88, JJ Electronics Amplifier Tube (T-12AX7-S-JJ) - $14. The 12AX7 is a high impedance amplifier triode and equivalent to the Mullard ECC83 where full details can be found. These can be used in circuits which don't use the 6. These are some of the best sounding 12AT7 tubes anywhere. For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. 6 pF Output 0. It is better to buy a JAN Philips equivalent than an Eastern European or Chinese model. This could then be bypassed by a 25 μF electrolytic capacitor if it was found that gain was too Find great deals on eBay for 12ax7 and 12ax7 mullard. 99 Sale price $79. (NB one tube does both channels input stage) I left the other, driver, tube as a 6SL7, to ensure i was comparing apples to apples. 12AX7A Tung-Sol 12AX7WB Sovtek Use in place of Tung-Sol for smoother top end and less upper mids. Colomor imported and distributed foreign valves. 95 each Evenly balanced, excellent harmonic detail, articulate, clear & open sounding, low noise, excellent for most amps! The Sino 12AX7 / ECC83 is a greatly improved version, is a cost-effective and suitable replacement for any 12AX7 / ECC83. Great for hi-fi amps. 2008 The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. A great tube for high gain amps or lower gain amps that are looking for a little more "bite". So far I can't find anything on the net to confirm. Two different triode systems equivalent to one half 12AX7 and one half 12AU7. Sun Jul 19 08:00:00 PDT 2020 Available for in-store or curbside pickup at select stores. These assumptions are: (i) a 3/2-power based expression for plate current, and (ii) a zero or near-zero expression for grid current. the GE is not as bright and is actually better for some things. 00 MSRP: $ 109. The manufacture date on these is 1985. If that brand is an ECC83 tube, you might be hesitant to make a purchase, but you needn’t be. Various lamp sizes and replacement wattages are available. Monday-Friday 8:30 am - 5:30 pm Pacific. The first audio tube produced with this technology was the 12AY7 in 1953. 5 Comments. $3. The seller had replaced preamp tubes recently and kindly supplied 2 GT spares. have tried nos & current made 12ax7's in v1 & v2 slots. 12AX7-A. 7025: This is the "hi fi" low noise version of the 12AX7. American Strat Style 5 Tube Data Sheet Locator. com 2 Triode 2A3B (2A3) 2A3C (2A3) 300B-98 (300B) 300BA (300B) 300BS-B (300B) 211 I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. 8 uV Interelectrode capacitances (typical), per section, with cathode grounded: Input 1. The 12AX7 is a twin triode basically composed of two of the triodes from a 6AV6, a double diode triode. Less highs too. Well matched, quiet performance, and in original boxes! See detailed test reports Overview. Vintage USA l ong plate 17mm tubes generally have these wonderful sound qualities. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. Reactions: bobmichigan , gitfruit , retnuH and 16 others A Hand Selected 12AX7A Provides 70dB of Gain Smooth, Warm and Fat Sound Quality; Variable Input and Output Gain Controls; Excellent as a Tube DI; XLR and 1/4" Inputs and Outputs +48 Volts of Phantom Power; Phase Reversal Switch; Portable, All Steel Construction; Dynamic Range : >100dB (20Hz to 20kHz) Equivalent Input Noise : -129dBu ('A' weighted T4XC transmitter- Loads up 107 watts to a dummy load but 40 watts when speaking into mic. 12AX7A/7025 China Gain Stage 4. This page cross references both ways. Type: 12AX7 Equivalent: ECC83, 6N2P-EV, 7025, 6057: Manufacturer: United Country: USA Comment: Grey plates. The ECC83 MG is a “Mid Gain” 12AX7 type tube. For a Fender Deluxe Reverb, Out of a full set of Electro Harmonix tubes, just pulled out the last bad one. Price: $17. 5 volt non-tapped filament. 99. ECC83: This is the identical European equivalent of the 12AX7. These are Triple Mica, grey plate construction with D-getters. Example #2: Fender Vibro-Champ Amp Preamp Valves 12ax7 ecc82JJ, 12ax7M | Hot Rox UK graded (see options on the valve page). A Comparison of Current Production 12AX7 Tubes. Similar to the ECC83 = 12AX7 Low-microphonics double triodes; close by characteristics to the ECC83 = 12AX7. The Accutronics brand reverb tanks has been around for over 50 years and has been featured in many legendary guitar amplifiers. This list is organized now by each vinta Analog Metric Limited Email: sales@analogmetric. I am not aware of any company making the original 12ax7 for over 60 years now so we would assume a tube newer than the 1950's production should be a 12ax7a version. It has different pin connections a ECC803S, it works only on 6. Gear returned in great condition, with only minor signs of use, such as slight scuffs or pick marks. 37 Google Original from CORNELL UNIVERSITY To Replace Use 9BW6 9CL8 9DZ8 9EF6 9EN7 9GB8 9U8 9U8A 9X8 10 10C8 10DA7 10DE7 10DR7 10EB8 10EG7 10EW7 11 11C5 11CY7 12 12A4 12A5 12A6 12A6GT 12A7 12A8 12A8G 12A8GT 12AB5 12AC5 12AC6 12AD5 12AD6 12AD7 9U8A 210T 12A6GT 12A6 12A8G, 12A8GT 12A8, 12A8GT 12A8, 12A8G 12AX7*, 12AX7A*, 12DF7*, 12DM7*, 12DT7 JJ ELECTRONIC 12DW7 ECC832 TWIN TRIODE, DISSIMILAR. Electro-Harmonix 12AX7 / ECC83 Preamp Vacuum Tubes (Three Pack) 4. Learn more about Fender electric basses. 20 $ 45. We stock thousands of pre-amp valves from NOS to current manufacturers like JJ, Electro Harmonix, Psvane, Tube Amp Doctor (TAD), Fender, Groove Tube and many more Ruby Tube's most popular and highest quality 12AX7A tube. Hughes&Kettner 12AX7A-C Selected, Pre-Amp tube. Sweetwater Savings: $ 20. It utilises four 12AX7A vacuum tubes, with two tubes used per channel in a fully balanced configuration – making it our very first fully balanced vacuum tube phono stage. It will reduce the gain in the power section slightly (basically meaning you need to set the volume control a bit higher for the same actual volume) and open up the tone a bit - clearer with more bass and treble, less midrange. Same as 12AX7 except for a 13. But it never hurts to have spares. LV does a good job of screening them, so that's where I go. Gibson Pickguard - Les Russian 6N2P-EV tubes. They were mistakenly branded 12AT7 by the National/Richardson company. The most desirable of the Telefunken ECC83 tubes is the “smooth-plate” or “flat-plate” versions. Best 12AX7 For Audio Genalex Gold Lion 12AX7. Made just like the 12AX7A greyplates, but have the bonus of the spiral filament for low noise. Sweet,a touch Forward,Dynamic and incredible inner detail. A cross refe Two 12AX7A Vacuum Tubes. Tubes, tubes, tubes! Find everything from the field of tubes: premium selected TAD tubes, TAD blackplate tubes, our beloved tubesets for nearly every amplifier out there, more brands and accessories. PRODUCT. (Referenced to Grid, Each unit):. 24. For recording, ideally, you’d want a low noise 12AX7A or equivalent tube in V1. All the mains brands are covered. History. I've also changed the default type for British amps to the ECC83 model as these amps typically were equipped with ECC83s (duh). that makes me happy w/ my amp. 20 Tube 12AX7 or Röhre 12AX7 ID3730, Double Triode, Noval, B9A and Audio Frequency shown. Jul 27, 2004 · 7247 and 12DW7 are equivalent (used in original Dynaco ST-35 and others) These are 1/2 of a 12AX7 and 1/2 of a 12AU7). There's no way to tell you why the designer is using a 12AX7 and a 12AU7 other than the two tubes probably serve different fiunctions in the amplifier. Parts List For A Pair Of MKIII Driver Boards (Just PCB parts): Resistors: 2 X 100 Ω 1% Holco Metal Film H4 (RN60 Equivalent) Equivalent input noise: -135dB average 10Hz-20kHz; Frequency response: 10Hz- 50kHz (-1dB) Signal to noise ratio: 115dB average 10Hz- 20kHz; THD + Noise: 0. All other specifications are the same as 12AX7. Genalex Gold Lion ECC83/B749 is the ultimate in current production 12AX7. 50. The Gain Factors for each are as follows 12AX7 = 100. It's commonly used as the phase inverter in some hi-fi amps, Ampeg and Fender amps. A good quality 12AX7 is important for reliability. , Shorted XLR balanced input,  For example, suppose a 12AX7 were chosen, with a plate supply voltage of The effective output resistance of the previous stage is the Thevenin equivalent of   The 12AT7 tube type is equivalent to the European ECC81 tube and can be used in They are slightly darker sounding than many other 12AX7/ECC83 tubes. 1, respectively, depending on which input is used - 12AY7 or 6072. Rated 4. Please call or email us with your request. And any company that tries to convince me that making their EL34 out of blue glass with a “coke bottle” shape is going to make it 12AX7A Mazda-Belvu tt 12AX7A. When it comes to 12AX7A, 12AX7B, and other suffixes on current production tubes, you can just consider it part of the product name and not worry too much about it. Saturday 9:00 am - 5:00 pm Pacific Apr 25, 2006 · So I asked a guy who sells tubes what would be a good choice of tubes for an amp to deliver both classic Marshall vibe and gain without beeing mushy, and he recommended me a tube which is actually a 7025 for V1 and the Chinese ones for V2 so, what is the main difference between these two types? Tube Preamp/Opto-compressor with Independent Circuits, XLR and 1/4" I/O, Transformer-isolated XLR Output, and 12AX7a Tube $ 129 . The Ruby Tubes ECC83 (12AX7A) Preamp Tube is a hand-picked Tesla with low gain and full, robust tone. Gold lion lacks tube taste, it is harsh like transistors, that is the main reason why I prefer 6n4 over gold lion. As such, they are some of the least expensive Mullard NOS tubes around. Guitar amplifier parts, guitar amplifier tubes and guitar amp tubes 12ax7, 6v6gt, EL84 Out of curiousity I built an octal to noval converter, and plugged in an ECC83 where the 6SL7 input tube normally goes, as they are very roughly equivalent tubes. 3V, and no gold pins. 3 year limited warranty. The JJ 12AX7 ECC83s (sometimes call a 12AX7 and sometimes called an ECC83s. . This page lists all of the 12AU7 tubes I currently have in stock, including all industrial and European versions. The D1100 Digital Preamplifier is a reference level stereo preamplifier and digital-to-analog converter (DAC). The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. 10x 12ax7a - $500. or Best Offer. The following guidelines should be taken into account: The free shipping option allows TubeDepot to choose the most appropriate carrier and service. pdf (630827 bytes) 12AX7A Hammond 125E or equivalent. There is also a page describing the reasoning behind the European valve numbering system. = . Web Store Phone Number: 1-855-588-6519 For service in French: 581-741-4663 These are all pin compatible with one another, the only differences being the gain factor of each tube. 12AX7 China Selected Use in place of WB if more gain is required. There are many differences, but the ones that make the biggest difference are the Gain Factor and the Plate Characteristics (including the Grid Voltage Curves). Great for cleaning up a harsh or overly bright sounding amp channel. medium output which makes for better control of gain sweep in bugera. 055% -32dB in +4dB out, 1kHz; Vacuum tubes: three 12AX7A; Warranty. This is the European equivalent to  12AX7 und ECC83: Sind NOS-Röhren wirklich besser? Verwandte Themen: Telefunken ECC803S. The 1 2-volt equivalent Of the 6146 is the 6883, the equivalent of the 6146A is the 6882A, and the 6146B is the 6883B. Ruby 6L6GC-CZ. It’s interesting to note the 12AU7 actually predates the 12AX7 by a few years. Is it fine to put a 6922 tube into a pre-amp that is using 12ax7 tube, the shape is the same, same amount of pins, so my question is can I? I know each tube has different characteristics, but generally speaking am I bound to run into some problems doing that, or is it a NO-NO altogether? As has been said they can often be used in place of a 12AU7, but they make good driver tubes. 3 amps. The 12AX7 cathode  The preamplifier's second stage 12AX7a tube runs on a regulated DC voltage Equivalent Input Noise, -128dBu typical (“A” wtd. In addition, the 6CG7 draws twice as much heater current so be sure that this will work in your circuit. Higher grade, hand selected JJ 6L6GC from May 02, 2016 · If you need a specific firmware or series relating to 12AX7A, we probably have it. 95. May 19, 2020 · I've also changed the default type for British amps to the ECC83 model as these amps typically were equipped with ECC83s (duh). upscaleaudio. 3V (they draw about 0. These are all pin compatable with one another, the only differences being the gain factor of each tube. Web Store. Heater 12. Condition New. They have the same pinout only the filament is 6. In the V1 it would have less gain than a 12AX7. We think that its standout feature is that it provides a very high level of gain and a great overall tonal quality with superior Hi guys, I picked up a Pro Junior yesterday off marketplace. ECC83/ 12AX7A-C-TAD RT001 Tube Amp Doctor This is the latest and improved version of the current Chinese 12AX7 and the factory have made great improvements in In stock £13. , Shorted XLR balanced input, gain at max) - Maximum Input Level: unbalanced (Inst): +15 dBu, balanced (mic): +10 dBu - Max Output Level: +19 dBu (Line mode) - Phantom Power: Switch selectable, +48 Volts DC, filtered, current limited - Tube Type: Hand selected 12AX7a Die ECC83 (amerikanische Bezeichnung: 12AX7) ist eine Elektronenröhre ( Doppel-Triode), die vorwiegend für Niederfrequenz-Anwendungen konzipiert wurde  12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. 9k. The valve Jun 22, 2006 · I think 5814 is equivalent to 12AU7 but again I am not sure Ferbose, these I would consider direct drop in's; ECC82, 12AU7A, 12AU7WA, 5814, 5814A, 6067, 6189, 6680, 7730, B329, B749, E82CC, ECC802, ECC802S, M8136, 13D5, CV4003and many others I have 2 amps which use 12AU7's one can use 12BH7's the other cannot. So if you are substituting you need to make a change. - Equivalent Input Noise: -128 dBu typical (A wtd. Tube Talk. Shop with confidence. The quality of Philips ECC83 has always been very good. Intended as preamplifier and driver or phase splitter in audio amplifiers. 12AX7 CHINA * 1980s * SPECIAL 12AX7 * V1 - $14. Jun 04, 2018 · Since today you'll pretty much never run into a series filament circuit and pretty much only will see parallel filament circuits, the difference between a 12ax7 and a 12ax7a is functionally meaningless and, as noted above, in current production tubes, you can't count on their being any difference between a tube labelled 12ax7 and one labelled 12ax7a. These are nice military spec tubes. In most tubes, like the 12AX7, the two sides are identical. RCA 12AX7A 14 mm / 1960's 7025 grey plate design. Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. Version of ECC803S, with electrical shield. Radio tubes are valves. You prefer the sound of a different brand of tube, I personally don't like groove tubes either so I'm really on board with what your saying. Specifications subject to change. Check stock and pricing, view product specifications, and order online. E. 6 volts at . Equivalent to 5751, 7025 & ECC83. I give it a 9 of 10 on cosmetics. impressions: warm & touch sensitive. Shuguang also has equivalent or more tube taste compared to 6n4. 46 pF max Grid to anode 1. tubemuseum. The Brimar 12AT7WA / ECC81 / CV4024 preamp tube comes in its original sturdy military package. Notify me when available. These are elite, top sounding musical dual triodes, and are able to do their job with as much detail as any other ruggedized or long life industrial equivalent. pdf (374410 bytes) 12AX7A Tung-Sol tt 12AX7A. , you can find even more. The Carvin Vintage 1 Although it is a gain stage, the amount of signal voltage gain is not high. For the rest it is fully equivalent to TFK ECC803S :) Best is Valvo. The latter, a common feature on "pro-level" devices, can come in handy when using the Tube MP Studio in a multi-miking setup. The points corresponding to these entries are shown as asterisks (*) or circles (O) in the charts below, where * is for Pentode charts and O is for triode charts, including pentode data in triode mode. Title: 12AX7 6AX7 Author: Sylvania Subject: JA-FP-2002-03-23 Created Date: 3/24/2002 12:54:30 AM 12ax7a 12ax7 12ay7? Discussion in 'Amp Central Station' started by moodus2006, Sep 14, 2009. 9-PIN MINIATURE TYPE. KCA NOS Tubes. ECC82, ECC802, E82CC, E80CC*, B749, M8136, CV491, CV4003, 5814, 5963, 6087, 6189, 6350, 6680, 7316, 7730, 12bh7*, 6fq7**, 6gu7**, 6cg7**, 6dj8**, 6AQ8** Nov 01, 2004 · Particularly the last two. Pls learn their differences clearly by comparing datasheet, pinout, and applications before you choose for a replacement. 3V filament tap. It is in MINT condition with its original box, manual and AC power cord. Additional controls include +48volt phantom power (required for powering condenser mics and some direct boxes) and a Phase-Reverse switch. There are many equivalent tubes with different names, some identical, some designed for ruggedness, long life, or other characteristics; examples are the US military 5814A and the European special-quality ECC82 and E182CC. For those with multiple turntables or tonearms, there are 3 sets of RCA phono inputs; XLR connectors are also available on 1 of the inputs. If you want to upgrade, go with a 7025 tube or a Good Ol' NOS Telefunken, Buble Boy, Valvo or RCA 12AX7. Originally, the 12AX7 / ECC83 vacuum tube was introduced to be a superior option for lower noise and microphonics over the 6SL7 tube that was commonly used in the 1940s. The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 48 mm tall. “ super strong quad set in boxes120% (new equivalent performance, as reference min = 70%) MATCHED, beautiful sounding & testing 1960's era, gleaming looks, close in production -- these are the real McCoy. The Ei ECC83/12AX7's were produced in Yugoslavia on Telefunken tooling and resemble the smooth plate Telefunken series. The ECC83 tube will perform the same as the 12Ax7. These series go as follows: 6883, 6883A / 8032, 6883B / 8032A / 8552 Again most offheseare "cross branded" with all of the tube numbers that are equivalent At the Workbench. Comes with original box and manual. 12AX7A Author: RCA Subject: FP-2012-01-14 Created Date: 1/14/2012 1:36:06 PM ECC83/7025 equivalent New (7) from $19. Tube. All now reduced to $60. Fender® American Standard Strap Button, Chrome. ECC83 tubes manufactured by Mullard, Telefunken, Amperex and Siemens are sought after. Add both to Cart Add both to List. In addition I feel like 12ax7-T shuguang has a little gold taste to the sound, it is flat in terms of mid high and lows. Ideally, every 12AX7 should yield the same gain when placed in the same circuit. Rated 5 /5 based on 3 reviews. Line item must be $25 May 01, 2019 · The original 12ax7 from the 1940s does not have the same performance as the later 12ax7a. 1 and the plate resistance is equal to 29. 50 + FREE Shipping. Show Details. 34A filament current) - easy to rewire TUBE CROSS REFERENCE BASICS There have been a myriad of tubes types and styles made over the years for industrial, military and commercial use. The tubes used in your Universal Audio hardware  The 12AX7-A is a miniature high-mu twin triode each section of which has an Equivalent Noise and Hum Voltage, Each Section, Average, True RMST. It is a long page, use your scroll button and scroll down the page to see it all. While the prototype works specifically with the. Now there are the tubes thatwere manufactu red far FM commercial service. 13 Amperex 12ax7aecc83 Double Triode Nib Goods Pair 4 Vintage Vacuum Tube When it comes time to replace your power or preamp tubes, zZounds has a great selection of classic designs. Aug 14, 2001 · GE 12AX7A - NOS EI 12AX7 The GE and RCA are different animals. It features the most advanced DAC we’ve ever used and delivers an unprecedented level of performance so that all your digital music is reproduced with exceptional accuracy and authenticity. Highly recommended for Singlepower Extreme headphone amplifier. However, in reality there are comparative gain differences among 12AX7s. Grade 2 (higher than average microphonics) Not recommended for V1 but good for phase inverters, cathode followers, tremolo tubes, $30. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. DOUBLE TRIODE ECC83S is 12AX7 high gain pre-amplifying double triode. Why doesn’t the Jolida Tube amplifiers have more features? One of the main objectives of Jolida amplifier designs is to maintain the “viability of the volt”, by controlling noise and the maximum bandwidwith of the music signal. It would be good as the PI. series circuitry in the SF Princeton, and may use either version. It also is a quieter and Warmer sounding tube. Equivalent input noise: -135dB average 10Hz-20kHz Frequency response: 10Hz- 50kHz (-1dB) Signal to noise ratio: 115dB average 10Hz- 20kHz THD + Noise: 0. V3 (shielded tube) Gain Stage 3. European and 4 digit numbers are listed in the table. Output Pentode Quick reference data • Anode current Ia=48mA • Transcoductance S=11,3mA/V Ruby 6550A-STR is a Chinese Shuguang(Sino equivalent) - selected by RUBY. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. Sophia Electric Premium 6SL7 (GTA equivalent) Tubes. Other then a huge difference in gain which is desirable the only difference is in heat dissipation. x Fender literally wrote the book on electric basses, laying the foundation for musical innovation and evolution. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more! Dec 19, 2017 · The difference between a 12ax7 and a 12ax7a has to do with the way the heaters are wired. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940s. Nov 20, 2016 · The ECC83 was the European equivalent of the 12AX7A and tended to be a bit more linear and clip a little harder. For High-Fidelity Equivalent Noise and Hum Voltage. 12AX7 Equivalent / Replacement . Results 1 - 28 of 28 RCA 7025 Black Plate Tube 12ax7 ECC83 ANOS Test 6681 12ax7a B339 NICE!! $80. Sometimes, 12AX7A tubes made for the US Military are labeled 12AX7WA, and I have seen WB and WC versions. Feb 12, 2010 · (1) A 12AU7 is identical to a 6CG7 electrically and in the circuit it will function identically. View entire discussion (11 comments) Store. 3 volts at . While its primary function is as a microphone preamp with +48V phantom power, variable gain and phase reverse switching, the Tube MP is also an exceptionally versatile tube driven direct box for any instrument source. Tubes marked with 12AX7 and 7025 both should be low noise, too. 99 * A 12AX7A/5751 and 12AU7A/12BH7A are utilized in a self balancing cascade differential amplifier circuit with headroom to spare. Price: $26. It was developed around 1946 by RCA engineers  All other specifications are the same as 12AX7. 5 Volt cell biasing V 1(a) and insert a 2. F. Smooth distortion. Variable Input Impedance 7025 Tube Equivalent Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. Sophia Electric 12AX7 Tubes: Interchangeable with Telefunken ECC Nov 28, 2018 · This unit requires one 12AX7/ECC83S tube at locations V2, V3 and V4. Great chiming tone with sweet, warm midrange excellent for Marshall and Fender amps. If desired, however, it would be possible to dispense with the 1. 12AX7A Equivalent Sovtek Preamp Tube: 56472: Reserve. 50 Buy Now; ECC83/ 12AX7A-TUNG SOL RU Tung-Sol Russia The Russian Tung-sol ECC83/12AX7 is a remake of the classic designed 12AX7 from the early 1960s. com) which converts to Eico-ese as: 12. A common substitution is to replace a 12AX7 with a 5751 or a 12AY7 to tame a preamp that tends to overdrive too easily, allowing you to get a better ‘clean’ sound out of your amp. Gibson Potentiometer - Long Shaft/500k/Tone Model: AT500. My 12AX7A that reads about 78 TUBE CROSS REFERENCE BASICS There have been a myriad of tubes types and styles made over the years for industrial, military and commercial use. These are all pin compatable with one another, the only differences being the gain factor of each tube. 00 10x 12ax7a Tube By Rca Usa Rca 12ax7a - $500. 5751 CV4004 CV492 B339. The designation has nothing to do with a spiral filament. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. Just doesn't have the longevity of the NOS tubes. 884. 7025 is a low microphony noise version of 12AX7. Many of these use European nomenclature. A common substitution is to replace a 12AX7with a 5751or a 12AT7to tame a preamp that tends to overdrive too easily, allowing you to get a better 'clean' sound out of your amp. The 6AV6 is a miniature repackaging (with just a single cathode) of the triode and twin diodes from the octal 6SQ7 (a double-diode triode used in AM radios), which itself is very similar to the older type 75 triode-diode dating from 1930. Large sound stage with excellent detail. warmth of tube covers up clarity of sound but might be ok for taming bright amp. 20. Excellent low noise version of the 12AX7, intended for critical industrial and professional applications. Since this is about modern production tubes though, I guess that means my vote is for the EI. simpson260. 00. 4 Review(s) $23. Recent NOS collection purchase yields 7 beautiful gray or silver plates labeled Ei and Groove Tubes. However, there is a different heater pin out. " It's only go to run it's optimum best with a handful of the right parts, but people like to tailor feel to their own specific ergonomics. " source Firmware Quantum 5. I am told it could be a soft audio tube 12ax7a or a diode. 00 / matched pairs Typical equivalent hum and noise voltage, per section, rms averaged, Rg=0 1. BUGERA Amplifier Tube, White (12AX7A) Lastly, there is the Bugera Amplifier Tube which is a high-end version of the standard 12AX7 tube. Portable Mic Preamp with 12AX7a Tube and 70dB Gain. Equivalent input noise: -135dB average 10Hz-20kHz: Frequency response: 10Hz-50kHz -1dB; Signal to noise ratio: 115dB average 10Hz-20kHz; THD+ Noise: 0. It is a great Bugera Exact tube replacement and is incredibly cheap. 12AT7 = 60. The Mullard 12AX7 / ECC83 is a Very Smooth Sounding tube. 12**7/ECC** is the north american/european equivalent to each other. Be sure to look for reviews by our customers and the Best Seller marker Store. Le syst me V3 (Variable Valve Voicing) est un ensemble de pr -r galges fournis par des professionnels proposant une "coloration" en fonction de la source (guitare, vocal It utilizes four 12AX7A vacuum tubes, with 2 tubes used per channel in a fully balanced configuration – making it our very first fully balanced vacuum tube phono stage. Mar 29, 2009 · ECC is a european designation, hence Marshall, from England came with ECC-83 pre-amp tubes, while Fender [american] came with 12AX7's, same tube, different designation. Many guitar shops will only carry one brand of preamp tube. Below is our current selection of 12AT7 audio tubes. The preamplifier's second stage 12AX7a tube runs on a regulated DC voltage providing an additional 20dB of gain. Includes 45-Day, No-Hassle Returns; Includes full manufacturer's warranty As no current is drawn from the dry cell and battery, their life is equivalent to their shelf life. 25 . Sep 14, 2009 #1. V2 (shielded tube) Gain Stage 2. Low-tension 45mm long, 2-micron thick aluminum ribbon design with typical "large, mellow" ribbon tone, and unique integrated 12AX7A preamp tube provides warm, detailed tube sound; Figure-8 pickup pattern for both front and rear side, with extended sweet spots; Versatile design, perfect for many applications, including vocal and instrument Vacuum Tube - 6681 / 12AX7A, Triode, Dual - Miniature high-mu twin triode especially suited for use in resistance-coupled voltage amplifier, phase inverters, multivibrators, and other applications in which high voltage gain is desired. History. 7025 is a 12AX7 that doesn't pick up vibration noise. It is a good tube to use for higher gain guitar amplifiers. C1000 tube Preamplifier, 8  The Telefunken ECC83 is maybe the one and only tube in the ECC83/12AX7 Reflector 'made in Russia' 8904 excellent 6N3P tubes equivalent of Chinese  (such as 12AX7A) need not concern us; they were once used to indicate a controlled it, so it could be imagined to be equivalent to a 225V / 1. 00 shipping. It has many circuit diagrams, using these tubes and all the information, about these original vacuum tubes. The ECC83 was the European equivalent of the 12AX7A and tended to be a bit more linear and clip a little harder. , etc. The compression circuit features a VCA-less design and utilizes optical electronics (Vactrol) coupled with a 12AX7a vacuum tube gain stage for superior musical performance. Watch  Items 1 - 40 of 153 Compatible Equivalents & Substitutes: 12AX7, 12AX7A, 12AX7EA, 7025, ECC83, ECC803S, 5751 (low gain), CV492, 7058, 12DF7, CV4004,  Valve equivalent list – Audio Research Integrated amplifiers & Power Amplifiers KT88, ECC803 / 12AX7A, 12AT7, Cool Damper. Amperex is a very good NOS tube. 7kΩ resistor in the cathode lead instead. Donations ECC83 Vacuum Tubes at Europe's largest retailer of musical instruments - fast delivery, 30-Day Money-Back Guarantee and 3-year Thomann warranty Also, it is a rule of thumb that one tube watt is equivalent to two or three solid state watts. The most important aspect of the input data is the data from the tube curves, in Vp, Vg, Vs (Pentode only) and Idata, below. Fender  The ECC83 Gallery 12AX7 E83CC 7025 ECC803S. The published difference is that the 12AX7A can be used with heater circuits wired in parallel and series, whereas the 12AX7 can only be used in parallel circuits. Tubes - EL34EH Early Mullard Style Output Tube. Order TubeDepot NOS-12AX7A-US (2197-NOS-12AX7A-US-ND) at DigiKey. 99 Sale. 00 Shop our great selection of 12AX7, 12AX7A, 12AX7EA, 7025, ECC83, ECC803S, 5751 (low gain), CV492, 7058, 12DF7, CV4004, B339, E83CC, M8137vacuum tubes now. I've just read that ECC88/6DJ8 is an equivalent for (and less noisy than) 12AX7/ECC83, and so ideal for use in phono stages. The reccomended tube for my phono section is a 12ax7. Tube Amp Doctor Premium Selected Preamp Tube, 12AX7A-C. AnalogMetric. There are also European numbers equivalent to all American tubes and military use numbers for tubes which would otherwise qualify as a generic 12AX7, AU7 or any other audio tube on the market. 5 out of 5 stars 26. The 12AY7 amplification factor is estimated to be 49. It is one of the best sought after European valves made. In modern gear you're unlikely to run into series heater circuits where your non-a 12ax7s won't work. Nov 12, 2015 · The equivalents for the 12AX7 are similar: ECC83 (European equivalent), 5751, 6057, 6681, 7025, 7382, 7729, etc. Mechanical Data. Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. 1 Review. 45. 99 Or $6 /month § for 24 months The 12AX7 is one of a family several miniature 9-pin B9A noval tube types developed during the 1940s, which include the 12AY7, 12AT7 and 12AU7. Over the past several months, I have been working on a new 2015 Musica Bella LeAnna preamp circuit. $45. Warranty. Upscale Audio 2058 Wright Avenue La Verne, California 91750 (909) 931-9686. 6 0, 35 45121 45161 3,5 2, 3,7, 8 1,6 . moodus2006 Tele-Meister In the past, I have always preferred to work with the 12AU7/6SN7 signal tubes (very similar anyway) for preamp circuits. Mar 23, 2008 · 12AX7A 12DF7 12DT7 ECC83 6BY6 5915 6BY4 2C22 12DW7 6V6 6AU6 6AU6A 7581A 6L6GC 1B3 Last update: 23 Mar. These have  street price of $280 with the chinese tube, and vintage RCA tubes sell for $40-$80 alone. The valve Mar 23, 2008 · Tube Interchangability Reference. 12ax7a This later version can be used in series or parallel filament circuits. Buy Ecc83 Valve and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many items tested in v2 slot of bugerav22. Newer serial numbers (4691 and above) use a 12AT7 (6072s equivalent). 055%, -32dB in +4dB out, 1 kHz; Vacuum tubes: 12AX7A; Warranty. The 7025 and 12AX7A were 12AX7’s with the helically wound heater incorporated for its lower noise benefits. Only a few tubes left. Also remember, you are not going to throw just any old tube in your phono section. ECC83. The 12DW7 has two different sides, one with a gain factor of 100 like a 12AX7, and one with a low gain factor of about 20, like a 12AU7. Gold Lion ECC83 delivers a full sonic range with excellent articulation. £4. The NOS tubes are becoming a little rare to   ← Cathode Bias – What Exactly is it? 7025 valve – Is it equivalent to the ECC83? →. pdf (602706 bytes) (fr) 12AX7A RCA (HB3) tt 12AX7A. A 12AU7 can take a much higher amount of plate current than a 12AX7 so by substituting the "12AU7" side, you increase the gain and lower the headroom, and an SVT already has TONS of gain. Ideally, every 12AX7 should yield the same gain when placed in the  ECC83: This is the identical European equivalent of the 12AX7. Played with an Epiphone Les Paul. Share  Best all-around choice and best value for 12AX7 • ECC83/7025 equivalent • Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers My understanding is that if the 6N2P-EV is an equivalent, it would be at least in theory superior to the 12ax7 as from what I gather it has a  27 Nov 2018 12AT7 and ECC81 are equivalent to a 6072. would buy another one cause i think Home; About Us The Canadian Vintage Radio Society is dedicated to the preservation, restoration, collection and enjoyment of antique radios and related items. 055%, -32dB in +4dB out, 1 kHz; Vacuum tubes: 12AX7A The 6414 is 1/2 inch taller than a standard 12AT7 and is a useful great sounding sub for a 12at7, 5965, or a 7062. Vintage SVTs used a pair. In older units (serial numbers below 4691), 6072 tubes are used. $5. #5. 2K 1 2 C1 50uF/450V 1 2 C12 100uF/25V 1 2 R10 Type: Structure: Date: Base: PDF: Sensibly equivalent ¶ to:: 7293: Camera Tube (Image Orthicon) P875 KT88 ECC803 / 12AX7A 12AT7 Cool Damper; C1000 tube Preamplifier: 8 × 8 × C500 tube preamplifier: 8 × 8 × C2500 tube preamplifier: 6 × C2300 tube preamplifier Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. Sound differences of preamp tubes in a Carvin Vintage 16 guitar amplifier in V1 position. * Compact, requires no modification of existing MKIII chassis sheetmetal. Oct 30, 2017 · Re: 12AX7 vs 12AT7 vs 12AU7. Visit us now! 12ax7a e83cc golden dragon triple mica new noxed valve/tube (lc66) £18. 12AX7 CHINA * SPECIAL 12AX7 * V1 **** Special 12AX7 **** One (Gain Tested) Chinese 12AX7 Preamp Tube * This is a Premium 12AX7 that has been Selected/Tested for Medium/High- Gain and Low Noise + Has a Black Shrink-Wrap Band around the tube to Further Reduce Microphonics and Noise ** Highly Recommended for Any V1 Input stage where a Low-Noise Buy Ecc83 Valve and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many items Early VT Spice models [1,2] are strongly based on assumptions made in tube circuit theory which were primarily intended to provide analytically tractable equivalent device replacements for use in hand analysis. Which are compatible with 6922 tubes? If I had an amp that took 6922, is it ok if I filled it with ECC88? What if I filled it with E88CC? What about a mix of 6922, ECC88, and E88CC? Thanks in advance. com http://www. You want as quiet and free from microphonics tube as possible and ergo suggest you get them from a reputable dealer that tests their tubes like Kevin Deal www. It can be used in the V1 (or equivalent) position in many amps to lower that first stage's gain a little and thereby achieve more headroom and a tighter overall tone. Gain. ECC83: This is the European equivalent to 12AX7: ECC803, ECC803S E83CC: This is the "premium" version of the European 12AX7. Recently I tried the very low gain 12au7 tubes in my preamps phono section. BIN HT. After a bit of playtime with the new toy it cracks, pops and snaps and volume dips sometimes (can post a video). To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. am using a used rca 12ax7 in v1 & makes a good match. Jan 24, 2003 · ECC83 is the European designation for the 12AX7: ECC83, 12AX7, 12AX7A, 7025, E83CC, E803CC, B759, 6681, 5751, 7729 E88CC would be a 6922 which is similar to the 6DJ8 or 7308: It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). Frequently bought together + Total price: $219. They are not cheap and are hard to find ,but once found well worth the effort and cost JJ Electronic - Vacuum tubes, Capacitors, Amplifiers. Jul 13, 2011 · Comparison between the 12ax7 and 12ay7 tube in a Vox Tonelab Desktop Model. DO NOT confuse these with current production Russian or Chinese crap with the suffix WX, WB, or WC! Jun 08, 2018 · What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes? Let's take a look at the less glamorous, but certainly important type of amplifier tube - the preamp tube. ECC83 diverser Hersteller Purchase 12AX7 / ECC83 vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to help upgrade your tube amplifier and  Graph Interpretation. The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. Western Electric marked this tube WE 420A for their own brand. Even the standard . These tubes are dual triodes - actually two tubes in one. pdf (176880 bytes) 12AX7A General Electric tt 12AX7A. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. This is what is usually called for in Fender amps. 75 . he SVT's preamp uses the 12DW7 (half 12AX7, half 12AU7) with the "12AX7" side as a gain stage and the "12AU7" side as a cathode follower. ECC803 / 12AX7A 12AT7 Cool Damper; C1000 tube Preamplifier: 8 × 8 × C500 tube preamplifier: 8 × 8 × C2500 tube preamplifier: 6 × C2300 tube preamplifier: 6 × 6 × C220 tube preamplifier: 4 × 4 × Rectifier Interchangeability and it's relation to Clean Headroom Here's the list of the most common guitar amp rectifiers in order of most to least clean headroom (highest to lowest voltage output) and least to most sag: Jan 14, 2012 · The model number just refers to the gain structure, 12ax7/ECC83 being the highest, then there is 12au7 which is the same as ECC82 and so on and so fourth. They possess a smooth and balanced response across the tonal spectrum and are extremely lively, open and expressive. Yes I recall your rolling experiments. 12AX7A: This is the second generation of 12AX7 tubes. The CVRS is a non-profit society run solely by volunteers. 11 Jan 2005 Oliver, how does the EF804S noise compare to a good 12AX7A? I think a preamp made with the 804 would be much more quiet maybe? The project emulates a 12AX7 vacuum tube triode as it would operate in a Fender Champ guitar amplifier. It looks and plays like new and may be considered an equivalent to display units found in retail stores. This is a real and true alternative to Telefunken ECC803S. A comparison of 11 preamp tubes 12AX7 / ECC83. Jul 16, 2018 · Electro-Harmonix 12AT7 Tube The 12AT7 tube is often found in reverb stages or in the phase inverters of blackface and silverface Fender amps in particular. 12AX7A: This version can be used in series 12AY7's will allow for a cleaner tone and a bigger sweep of the gain and volume controls on your amp. 055%, -32dB in +4dB out, 1 kHz Vacuum tubes: 12AX7A . 6mA 141k. The 12AX7AC5 is known for clear highs and mids with a slightly subdued low end that make some amps feel tighter. Comes with a 6-month replacement warranty. In many cases, these tubes are interchangeable and can easily be swapped. This type is identical to type 12AX7A except that it has a controlled equivalent noise and hum characteristic. Saturday 9:00 am - 5:00 pm Pacific Qualified orders over $99 will ship to you without incurring a shipping fee. ARS 12AX7A / ECC83 - $12. pdf (175904 bytes) 12AX7A RCA (RC30) tt 12AB5. (both are accurate) is a well balanced colourful tube with strong lows & mids whilst also providing smooth highs, allowing for more clean head-room compared to some of the higher gain 12AX7s. I upgraded this one with a vintage RCA 7025 (a low noise 12AX7A equivalent) and, IMO, it sounds A LOT better than the stock chinese Ruby tube that it came with. Our SPAX7's are a premium grade substitute for the standard 12AX7 - They are a "Special Requirement Preamp Tube" that possess an even higher standard of overall performance than our high-quality 12AX7 due to their incredibly low sensitivity to microphonic noise. ANSWER- The Chinese 12AX7B tube has a higher gain and a little more overdrive than the standard 12AX7A tube. Five Star ***** 5963. com (and has phono quality, Mark www. Russian-made Mullard Reissue 12AX7 dual triode. The W is the military type code, A,B, and C are progressively later productions. Telefunken tubes have a diamond shape molded into the glass on the bottom center of the tube. In addition, a 6005W tube is required at location V5. 12ax7a equivalent

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