12ax7a equivalent. I need to mod a circuit to be smaller.

12ax7a equivalent. 3V or a 12. In many cases, these tubes are interchangeable and can easily be swapped. So don't get suicidal about the world running out of tubes just yet. It is by far the most commonly used preamp tube. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). The anodes are folded and stitch on one side. 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. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. Replaces any ECC83, E83CC, 12AX7, 12AX7A, 12AX7M, 12AX7WA/WB/WC/LPS/EH, 5751 or 7025 tube. This tube is sometimes called the equivalent for 6DJ8/ECC88 or 6922/E88CC. This allows for a seamless transition. The others range from close to somewhat similar best to compare data sheets before trying. May 10, 2025 · You will also find all the details regarding ECC 83. Learning when to use a 12ax7 vs 12at7 preamp tube can be a great decision for your sound. The 12AT7 is found in many high fidelity applications, as each triode section in Aug 3, 2021 · Here are some tubes that you can sub for 12AX7 tubes. Sep 7, 2013 · The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. In guitar amps, you can try different substitutions for 12AX7 to get a different tone. distorts less), and the tone will be different. 3V heater, but the center-tapped design allows operation at either voltage. Discover everything you need to know about the 6N1P tube, including its datasheet, pinout, equivalents, and comparisons to popular tubes like 12AX7, 6922, 6N2P, and ECC88. It is used in pre-amplification cascades on resistances. The 12AX7 is a miniature dual triode vacuum tube, also known as an electron valve, that has played a significant role in the development of electronic equipment, particularly in audio applications. The Chinese 6N4 (whose military issued variant is known by the designation 6N4-J) which is a pin-compatible replacement for the 12AX7 but has an amplification factor of 97. We will take a look at why you might, or might not want to swap out the different types of tubes. 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. There is also a Russian one out there, can't quite remember right now. This flange provides additional heat sinking and a point to attach the support. But is it safe to do so? What are the differences? Jun 15, 2011 · Mu of 5755 is 70 (vs. I have a couple sylvania branded tubes which seem like a near perfect match in the amp. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. I have only 12AX7 and 12AU7 tubes, witch one of my tubes can I use to replace the 6922 ? Thank Bye Gaetan The mighty 12AX7 has been powering amplifiers since the beginning of rock and roll! But this tube is not well known by many. Presumably these types where designed as miniaturized replacements for the octal 6H8C (6SN7) -6N1P and 6H9C (6SL7)-6N2P . Introduced in the late 1940s by RCA (Radio Corporation of America), the 12AX7 was designed for use in high-fidelity audio Jun 8, 2018 · The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. This is actually two valves in one glass envelope. Read our reviews and ratings. ECC83*, CV492*, E83CC*, etc. In the 1970s an improved and more rugged version of the 6N2 was introduced, designated 6N2P-EV (Russian: 6Н2П-ЕВ). The Bold listings are shown as equivalents in a tube manual, and could probably be sustituted without any changes other than rewiring (but check dissipation rating for power tubes!). 12AT7, 12AU7, 12AY7, and 5751 tubes are related to 12AX7. Other 12AT7 tube equivalent part numbers are ECC81, 6201, CV4024, and CV455. I would suggest just try to find the correct tube to be on the good side. In modern gear you're unlikely to run into series heater circuits where your non-a 12ax7s won't work. It is for having DC on the heaters in a LA2A clone to see if it will make the device more quiet. According to us, must a tube which can be used Aug 20, 2018 · FWIW, 6CG7 / 6FQ7 are electrically equivalent to 6SN7. For example, Shuguang used to mark their tubes as 12AX7A, and then they started marking them as 12AX7B. Colomor imported and distributed foreign valves. Just interested in hearing some opinions on whether these exclamations are accurate. The “12” in 12AX7 indicates a 12. Be sure to look for reviews to help you find the best 12AT7 preamp tube More Details Sep 20, 2023 · Compare the difference between 12AX7, 12AT7 and 12AU7 tubes and see which one is best for you. You might also like this HumbuckerSoup article: What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes? The 12Ax7 tube is by far the most popular preamp tube used in guitar amplifiers. It has a center-tapped heater filament so it can be used in either 6. Some of these can be found at a much cheaper NOS price than 12AX7s and are better. Sep 22, 2019 · For those of you that have questions about the preamp tubes available and which to use in each row, and why you might not want to just use any tube an Jan 17, 2021 · I'm game-on to explore tube-rolling the 12AT7 preamp tube of my 300b amp. Feb 9, 2009 · 12AX7A is the same as a 12AX7 except with a controlled warm-up. Best sounding tubes. In many cases, these tubes are interchangeable… Nov 5, 2003 · 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. Whether you are replacing the preamp tubes in your amp for the first time or are a certified tone snob (like us), here is our list of the best 12AX7 vacuum tubes ever made to help Mar 16, 2010 · There's no plug-in equivalent to 6EU7, but the socket can be rewired for 12AX7, which is equivalent except for bas connections. Description The 6N2P-EV tube are a replacement for 12AX7 in any typical amp application, but they have 6. Each tube represents a unique combination of heritage, design, and performance, catering to different preferences and applications. Very cool and rare 50s era black plate with D getter 12BZ7 tube, is a substitute for 12AX7, fun one to experiment with, tested near new at 103/1 and sounds great. 6V heater supply. It is what is called a ‘double triode’. I have a stock of them because they tend to cost less. 7 tubes differenceQuote from: demym on October 27, 2010, 04:18:49 PM That is, would a 6112 at 100V crunch in the same way a 12ax7 (or a 6112 mu equivalent) would at 200-400V range ? No, they are completely different devices. The 12AX7 is a miniature high-mu twin triode. Without a thorough knowledge of tube types and their substitution possibilities, you may be over-paying for your new or NOS tubes you Discover the similarities and differences between ECC83 and 12AX7 tubes. Nov 17, 2016 · In loctals, 7F7 is the equivalent of the 6SL7 and 7B4 is equivalent of half a 12AX7. My question is can I use a 12ax7 in place of the 7247 or do I need to change some resistors. Tubes in the "Tube" column are directly replaceable with tubes in the "Replacement" column. Does Below is our current selection of 12AT7 vacuum tubes. The central column is a support for the getter holder. Mullard describe the ECC83 (=12AX7) as a high μ double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter. Oct 22, 2017 · 6N2 is the Chinese designation for the Russian 6N2P (6Н2П in Cyrillic). Feb 6, 2017 · Can I swap a 12AX7 for a different tube? - Amp TubesIn an amp’s preamp section, you will usually find anywhere between 1 to 6 preamp tubes depending on the design. Levi I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. Seeking to try different 12AT7 NOS tube and 12AT7-substitutes (not 12ax7 or Mar 22, 2013 · DIY guitar enthusiast and Amped guest blogger Kurt Prange, who works at Amplified Parts in Arizona, compares 22 different brands of 12AX7 tubes to see how they differ RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. You can Mar 24, 2013 · Excerpts from the Comparison Document: Graph Interpretation All 12AX7’s have an amplification factor (_) of 100 (“high-mu”). Apr 22, 2018 · 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 grounded shield on pin 9 to reduce crosstalk? They also seem to be rated for more hours and are built to be more robust (for mil application). I would choose in the regular 12AV7, RCA or Tung-Sol, because I consistently find that these manufacturers are as good as any and better than some Mar 26, 2016 · If you were looking for a tube electrically equivalent to a 12AX7 with lower gain, the 5751 is what you're looking for. The purpose of this comparison is simply to provide guitar players with a frame Jul 26, 2006 · 12ax7a, 12DF7, 12DT7, 7025*, 7025a*, 12AD7 (filament issues possible), 12AU7 (in a pinch, may not work), 12AU7a (same warning), 12bZ7 (filament), 12DM7 (filament). But there are many “equivalent” tubes that can be used in these positions. We find this incorrectly! [/size] [size=x-small] Unfortunately will the notion "equivalent" not be interpreted the same by everybody. In the cases tabulated below there are more than one valve for a given VT marking. JJ Electronics Amplifier Tube – T-12AX7-S-JJ (Editor’s Choice) JJ Electronics Amplifier Tube is the best 12AX7 tube available on the market at the moment. Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. That's a good segue to discussing the 12AX7 The 12AX7 is a high-gain dual triode. 35 KB Datasheet 12AX7-Marconi. Anyway, Im starting to get into rolling tubes and Im looking to replace my 12AX7 tubes. Other than that, it is the same After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. Jan 24, 2023 · 12AX7 tube specifications, pinouts, equivalents and comparison with ECC83 tubes in replacement, which is a full copy. See chart below for all the variations. Directly replaceable tubes can be easily swapped with the 12AX7 without any modifications or adjustments to your equipment. One more question that might arise is if the ECC83 and 12AX7 are interchangeable. for 12AX7 - 5751 - 12AT7 - 12AY7 - 12AV7 - 12AU7 - 12DW7 ? Dec 10, 2010 · Re: general differences between 12a*7 and 5751 tubes? similar to a 12ax7 but with less gain. Jun 28, 2019 · In this post, we are going to look at one such example, the ecc82 vs 12au7 tubes. Jeremy Harmer for his kind permission to 12ax7a: Can be used in series or parallel circuits. Ive researched and spoken with numerous people about the many options out there. The European designation is EF95. Jul 17, 2020 · Hello - Im relatively new to Tube Amps - made my 1st purchase a little over a year ago and bought a new YAQIN MC-13S. I think the 7025 designation was for 12ax7 tubes made Mar 10, 2010 · [size=x-small] Since some time there is a Russian tube on the American and West-European market with the code 6H1Pi that is translated 6N1P. The 12AX7 is a high impedance amplifier triode and equivalent to the Mullard ECC83 where full details can be found. The "B" suffix doesn't mean anything, except that it is the version after 12AX7A. Great for audio applications that uses a 12AX7. 12Ax7 Tubes. 5 is the closest equivalent to the 6N2P. Oct 17, 2007 · 12AX7A - This version can be used in series or parallel filament circuits. May 11, 2008 · Here's what the Pittman book says, in regards to Ampeg: "Courtesy of the MTI company when they owned Ampeg. As well it offered more gain. Current Production: 12AX7 equivalent tubes are being produced at Reflektor, Ei, JJ and Chinese factories today. 12AX7 (also known as ECC83 [1]) is a miniature dual- triode vacuum tube with high voltage gain. In most cases, they can all substitute for each other. When you see a tube amplifier it's likely that 12AX7 tubes are powering its preamp because of the gain it produces via higher voltage. I would never use it. However they This list was expanded from a list here (thanks to Jim Cross!). I have not used either myself, but for what it's worth here's my take. 6AK5 variants include 6AK5W, 5654, and Western Electric 402A. The thin glass tube envelope is 21 mm in diameter Related Post: Soviet/Russian Tubes Equivalents Sep 15, 2020 · Confused about which tubes to get? What are the differences between 12AX7 vs 12AT7 vs 12AU7 tubes? Learn common applications and options for swapping tubes. Aug 26, 2020 · This is a list of Soviet and Russian tubes and their American/European Equivalents. Many manufacturers marked 12AX7's as 12ax7 without the “A” suffix well into the 60's and 70's, but these are most often 12AX7A's marked as 12AX7. Pretty much everything I'm looking at copying was built arund 12AX7's, and I've Sep 17, 2025 · Are you an audiophile and looking for an alternative to the Chinese tube buffers/preamps? If you need to change the 6J1, the American equivalent of the 6J1 is the 6AK5 or 6J1P-EV. The 12AX7 is one of the most widely used double triodes in audio circuits. usually gives you a brighter, cleaner sound, little less compressed when running the volume up high on a nmv amp Jan 10, 2003 · You can substitute a 12AX7A, a 7025, or if you only need a single triode a 6AV6. Jan 4, 2019 · What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes? Let’s take a look at the less glamorous, but equally important type of amplifier tube – the preamp tube. They are in excellent overall cosmetic cond May 11, 2020 · PSvane 12ax7-t mkii vs Shuguang 12AX7B Discussion in ' Audio Hardware ' started by beartrackrecords, May 11, 2020. Learn the history, specifications, and The mini but mighty underdog, 12AX7’s are one of the most important devices ever made, yet players and listeners alike consistently overlook them when considering how to improve the performance of their gear. S. While the power amp situation is obviously different, my focus at the moment is just getting the pre-amp as close to the 'original' as I can. The T-12AX7-S-JJ vacuum tube from JJ Electronics comes as an immensely versatile preamp tube, compatible with hi-fi and guitar amps. Designed to amplify low frequency voltage. Price is for a Single Tube Aug 16, 2017 · Equivalent tubes to 12AX7's needed. (ECC81 Nov 4, 2018 · Is there a single triode in 7 or 9 pin package or a twin triode in a 9 pin package, that is an electrical equivalent to a 6SL7? The way a 6CG7 is equivalent to a 6SN7. The Chinese 6P1 and the Russian equivalent 6P1P also have no Western equal. Apr 14, 2025 · In most cases, you can substitute a 12AX7A for a 12AX7 without any issues. Russian rare tube 6N2P Reflector factory. Vintage versions of these are about the most sought after tubes of any type today. These are all electrically like the USA 6AQ5, but have a 9 pin base, making adaptation difficult. Jul 14, 2014 · Is there an octal tube that is very close to the 12AX7? I am putting an amp together and want to keep the tubes octal if I can with out a lot of changes. Most of the common Ampeg bass and guitar amps used 12DW7 preamp tubes, which makes things a little sticky since the tube was discontinued. Oct 27, 2023 · I think you mean 12AX7, as that is the equivalent of ECC83. These usually date to the 1960s and have greyplates. The only other sub is the Russian 6N1N. It's a mini dual-triode vacuum tube that has become one of the most common types of vacuum tubes used in guitar amplifiers. Aug 20, 2014 · Amazing replacement for Mullard Ecc83 / 12ax7 Everyone That I had listen to the 5755 tubes in place of the Mullard old stock 12ax7 was blown away. TL;DR Yes, you can swap a 12AX7 with 12AT7, 12AU7, 12AY7, or 5751 tubes. The 6SL7 is the one I would use because they are the equivalent to the original 12AX7 (or 6EU7) that the amplifier normally uses. Since both tubes are pretty easy to come by, I'd be glad that they sound the same and buy whatever your amp needs. 6AV6 is closest equivalent to half a 12AX7. These 3 have matching date codes: March 13, 1967 and were made in the Ulm factory. The 12AY7 valve (also known as the 6072) is a 9-pin tube. Highly durable, low-microphonics double triode, close by characteristics to the 12AX7, ECC83 May 31, 2018 · 12ax7 vs 12ax7a Discussion in ' Audio Hardware ' started by Tablet Man, May 31, 2018. Discussion in ' Audio Hardware ' started by Benzion, Aug 16, 2017. The 12AX7A is a military specification, essentially subjected to tests that the 12AX7 is not. The 12AY7 valve versus the 12AX7 (ECC83) valve. A 6EU7 is the electrical equivalent with a non-paralleled heater. Aug 9, 2010 · Nostalgic Kit CentralTube Interchangability Reference The following should be direct substitutions. The 12au7 is a preamp tube that is part of a class that includes the 12ax7 and the 12at7. The European designation is ECC83. This list was compiled from the CV Register and several other sources. Current production 12AX7 on market today are: Sovtek 12AX7LPS Sovtek 12AX7WA Sovtek 12AX7WB Sovtek 12AX7WC TungSol 12AX7 Russian-Issue Electro-Harmonix 12AX7EH Electro-Harmonix 12AX7EH Gold Shuguang 12Ax7C9 EI 12AX7 Silver Bullet EI Jun 20, 2007 · My own opinion: 12AX7 is insufficiently linear. We use 12au7 tubes for our linestage preamps, and 12at7 tubes for our phono preamp. The Russian 6Pi14Pi is another version of the 6P14P and Chinese 6P14. I have the adapter to go from 6eu7 to 12ax7 and find them very similar in sound on the same system. Check out the following tube reviews for guidance in getting the best possible tone out of your tube preamp. What an awesome tube. 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. Would parallel sections of a 12AX7 or 12AT7 work? I can make some changes but I want a The Chinese 6P1 and the Russian equivalent 6P1P also have no Western equal. There are several variations of the 12AX7. 6V 150mA heater circuits. But, it might be helpful to us tube Feb 8, 2008 · The 6AV6 triode is electrically identical to one of a 12AX7's triodes, and pretty much every amp out there that uses 12AX7's runs the centertapped filament in parallel on 6V anyway. 12AV7's appear to be very close to the 12AY7's but I might be missing the bottom line on compatability. After all, a 12AT7 and a 12AX7 do not crunch the same, even when operating at similar voltages! The voltages are largely irrelevant, what matters Feb 17, 2014 · 6SN7 is equivalent to a 12AU7 6SL7 is equivalent to a 12AX7 If your 6SN7's have enough gain for you, then use them. pdf Description Double Triode 7025a 12AX7A Equivalent Sovtek Preamp Tube Suitable for the preamps of all Traynor amplifiers and most Fender, Marshall, Mesa Boogie and Vox amplifiers. 3V heater voltage and would need a different wiring than stock 12AX7’s. If your amplifier or effects pedal is specifically designed for the 12AX7, it’s best to stick with the original tube. The 12AX7 is typically used as a class-A amplifier in the hi-fi Looking For 12AX7 tube equivalent? Check Our 6N2P tubes for your AMP! What is a 6N2P Amplifier Tube? The 6N2P, (Russian: 6Н2П), also sometimes spelled in English “6N2Pi”, is a miniature 9-pin dual triode vacuum tube manufactured in USSR, Russia and China with characteristics similar to the RCA 12AX7. Near equivalent: 12AX7, ECC83 E – characterizing the increased durability of the tube; V – tube with increased Find the right 12AX7 tube for your amp! We have a large selection of 12AX7 tubes and the know-how to help you select the right tube for your gear! Jan 26, 2012 · The 7247/12DW7 is a actually a dissimilar twin triode. They are dual triode tubes Jan 29, 2018 · I think 7025 is the military spec equivalent tube. This guide will thoroughly compare 12AX7 vs 12AT7 to help you decide which tube is going to make your guitar sound the best. So far I can't find anything on the net to confirm. Different pin-out too. Some others listed that aren't in the title are: 12DF7, 12DT7 and B759. Feb 13, 2006 · 2006-02-13 2:27 pm #5 Hi Darren, You may find the GE's noisy (like some 12AX7's I ran across). As Frank pointed out in an earlier post the 12BH7 in most cases is a plug in for the 12Au7. Depending on how the heaters are powered in the Get a detailed comparison of ECC83 vs 12AX7 tubes to understand their unique characteristics & applications. Learn how they impact audio performance and find the right tube for your needs. The 6FQ7/6CG7 is my favorite in the Aikido line stage as an input tube. Also, I wouldnt' recommend using a 12AX7 in place of a 12AT7 in a reverb driver. 12AX7A ECC803S, E83CC, E803CC, 6L13 B759 12DF7 7025 12AD7 12DT7 12BZ7 7729 6681 7058 Nov 25, 2017 · 6eu7 sounds basically the same as their 12ax7 counter parts. You can also consider tubes such as EF95, M8100, The 12AX7A tube is an absolute classic in instrumental and Hi-Fi amplifiers! The TubeAmpDoctor magazine presents this all-rounder! May 7, 2023 · The 12AX7 tube has been around since the late 1940s. These were supposed to be a really low noise type tube. With the important difference being that pin 9 is the internal shield between the two sections that is normally grounded. Made RCA, GE, Sylvania, Zenith and other brands. I fixed the hum issue with some wire dress changes. 6V heater, while the “E” in ECC83 signifies a 6. Are you looking for the very best 12AX7 preamp tubes for your amplifier? This is the place to start. The Bugera 12AX7A is most likely the best of the modern day manufactured tubes. 00 ea. 3v 300mA or 12. Oct 27, 2010 · Submini and regular 12a. Here are some of the most common ones: 12au7 equivalents: 12at7 equivalents: 12ax7 equivalents: Return to Blog. That's why you see them in the mic inputs instead of 12AX7's. They give you more headroom (i. Have no fear, however, because we have the official Ampeg changeover operation and it's pretty simple to change over and use the very common 12AX7 Up For Sale 50 Pcs The price 250 USD is for 50 Pcs Tested on Amplitrex AT1000 Advance Digital Tube Tester 6H2N 6N2P ECC83 NOS Military Spec preamp tube (12AX7 substitute) standard. I guess that was really my question. You One of the most commonly found driver tubes found in push-pull vacuum tube audio power amplifiers is the 12AU7 preamp tube. 7025 is a 12AX7 that doesn't pick up vibration noise. I think in the long run, you will be better served I did it in my 1965 Princeton Reverb to give me more range on the volume control (My band is acoustic-based and plays at low volumes) and it works well. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more! Thanks. The 12AX7's with adapters sounded no different to me from the 6EU7's and I'm back to using the 6EU7's in this amp. Nov 25, 2018 · I have a Magnavox 9300-series EL84 amp that came to me with a right-channel hum. When a tube is labeled 12AX7A/7025, is the 7025 listed there as a replacement or equivelent part number? If a tube is a true 7025, would that or should that be the only # listed on it? Aug 21, 2015 · Anyone ever try these tubes out? Over on Audiotubes. All you have to do is switch a few wires on the tube socket and for 15. May 18, 2019 · For example, there are low-noise versions that are being substituted, such as the 12AX7A, 12AD7, 6681, 7025, 7729, and plenty more. you will get the very best Jul 31, 2014 · As the topic suggests I am looking for a 12AY7 and 12AX7 equivalent or similar tube which take 6,3VDC for the heaters. Please report any Apr 3, 2024 · Howdy, Love using subminiatures and while I've got a couple of scratch-builds under my belt, I'm looking at emulating a couple of the most classic amp topologies with them. But if they're cheap give them a shot. Should work fine if adapter is wired correctly. Feb 18, 2018 · Hello Many tube amps use the 6922. This is an American design that was copied by other companies. And the only difference between 6CG7 and 6FQ7 is an internal shield between the two triodes that's brought out to a pin for grounding in the 6CG7. As well, this tube's low gain make it a great choice for tube preamps in hi-fi stereo systems. 6SL7 is a much better choice and the fact that its mu is only 70 compared to the 12AX7's mu of 100 should not matter in most applications. These are the coveted gold pin / diamond bottom version considered by many to be the finest 12AX7 equivalent ever made. Sign In FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! FREE! 1. Siemens CV492 - lower output than a regular 12AX7, but has a The 7025 and 12AX7A were 12AX7’s with the helically wound heater incorporated for its lower noise benefits. We wish to thank Mr. These are all pin compatible with one another, the only differences being the gain factor of each tube. It has become popular in audio circles though. They are also WAY cheaper than a 12ax7 Telefunken! We would like to show you a description here but the site won’t allow us. I thought it might be a tube issue and got some adapters and 12AX7-equivalent JJ drivers. If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. Ideally, every 12AX7 should yield the same gain when placed in the same circuit; however, in reality there are comparative gain differences among 12AX7’s. Ed Oct 9, 2019 · The best 12AX7 tubes for almost no money For a newcomer it is not easy to navigate among NOS tubes that are available through Ebay or similar sites. Check out the following vacuum tube reviews for guidance in getting the best possible tone out of your tube gear. Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947. Mar 10, 2007 · Correct me if I am wrong but I think that the octal equivalent to the 12AX7 is a 6SL7, and a 12AU7 is a 6SN7. The 12AX7B are valves that basically surpass the standard required for military spec valves. My tech said it would be safe but I DON’T know if it’s OK to swap a 12AY7 for a 12AX7 in every application. The reverse will not necessarily be a correct replacement. Due to the numbering schemes in use there are three variant classifications of VTxyz valves; the USA types, the UK military types (VT = Valve, Transmitting), and the UK GPO types. Other 12AU7 tube equivalent part numbers are ECC82, 5814, 6189, and CV4003 More Details The 6N1 is equivalent to the Soviet made 6N1P like stated below. The specs look the same as 12AX7's otherwise (by 12AX7, I am referring to 12AX7A/7025 Jul 11, 2021 · The 6EU7 was a hi fi tube well on par with a real 7025 low noise high performance 12AX7A, only with a different pin out, and the lack of a 12 volt heater option. What is a 7025 Tube? 7025 is a low microphony noise version of 12AX7. 100 for 12AX7) so it's closer to 5751 - it's supposed to be a miniature equivalent to 6SL7. Jul 22, 2014 · A Comparison of Current Production 12AX7 Tubes by Kurt Prange RCA and Sylvania first introduced the 12AX7 to the world in the late 1940’s. I need to mod a circuit to be smaller. No brand labels, but I'm still researching these to find out who made them - probably RCA Ei Elites 12AX7EG gold pins - lots of detail and forward presentation. *=exact replacement-cross Then the Euro equivalent numbers for a true 12AX7 cross. There may have been other low noise technologies incorporated as well, but this is the only one I’ve been able to find so far. Tube Jun 12, 2025 · The 12AX7 and 12AU7 tubes serve different roles in an amplifier due to their distinct electrical characteristics. This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. For preamp tubes - these are all getting tested and listed now, and they are double tested - once on the TC154 tube tester and once in Tube Equivalents List 0A2 AG5211 0A2 SR56 0B2 SR3 108C1 OB2 10BQ5 YL84 10C14 19D8 10CW5 LL86 10CW5 YL86 10DE7 9R-AL1 10DX8 LCL200 10DX8 LCL84 10DX8 YCL84 10EB8 11JE8 10F18 13EC7 10F9 12AC5 10GN8 11JE8 10GV8 LCL85 10HF8 11JE8 10JA8 11JE8 10JY8 11JE8 10LD13 14G6 10LD3 14L7 10LZ8 11JE8 10P18 45B5 10PL12 50BM8 11BM8 LCL82 11JE8 10EB8 11JE8 10GN8 11JE8 10HF8 11JE8 10JA8 11JE8 10JY8 11JE8 10LZ8 11R3 Sep 16, 2007 · will a 12ax7 sub for 12dw7/7247 ? I recently bought a bogen pa amp and it uses both 12ax7's and 7247's in the preamp. Please report any Jul 8, 2010 · I have a Philips NOS E88CC valve - can it be used as straight swap for ECC83 ???????. The 6N2P may be used as an inexpensive substitute for the 12AX7 by using a socket adapter or simple re-wire of the heater circuit. It was originally designed as a low noise tube and was actually developed… Need vacuum tubes? Want to build your own amplifier? Have an unhealthy HiFi obsession? We've got you covered. One section is a Hi-Mu Triode (1/2 12AX7) and the other half is a Medium-Mu Triode (1/2 12AU7). Often RCA and GE made these for electronic organ manufacturers, and have the organ brand name on the label. Buy JJ ECC803S / 12AX7 preamp vacuum tubes in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. If you are looking for a specific brand, let us know and we'll take a look for you. The 6FQ7's in a RCA clear top will in most cases out shine the 5692's. Find out why it’s a top choice for audiophiles and guitar enthusiasts. 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 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio As seen in many tube substitute books, the 12BZ7 is a substitute for the 12AX7. These tubes share similar electrical characteristics, mechanical dimensions, and heater requirement. I am asking simply to learn more about the tubes as I am learning how to repair tube Apr 28, 2015 · I'm sure this is common knowledge to many of the tube guys here. However, there are some scenarios where it’s not recommended. Other equivalent tubes are CV491 and 7025. For sale are 3 gorgeous Telefunken ECC803s tubes. TAD Premium Selected tubes undergo very strict quality control, passing the following: - Low Noise Test - Microphonic Test - Gain Test - Sonic Tests - Shock Tests - Listening Tests - Balanced Output Test Highgrade is the tip-of-the-top quality at the Aug 9, 2010 · Nostalgic Kit CentralTube Interchangability Reference The following should be direct substitutions. The characteristics of that tube are essentially equivalent to the 12AX7, except it has only a 6V heater option, and this is not a direct drop-in for the 12AX7 -- a slight wiring change is required. You are reading the older HTML site Positive Feedback ISSUE 76 november/december 2014 My Favorite Tubes and Their Substitutes by Robert H. This exhibit is a genuine English The ECC83 or 12AX7 is a miniature 9-pin high gain (100mu) dual triode tube. JJ E83CC / 12AX7 preamp vacuum tubes in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. A centre tapped heater permits operation of the tube from a 6. The JJ 12AX7 preamp tube is highly sought after by bassists and harpists as it helps reproduce Apr 6, 2014 · This tube, and its industrial equivalent the 5965, is not much used in guitar amps as it is basically a 12AT7 with lower gain. 12AU7 would be ECC82, and has considerably lower gain than a 12AX7, so if your Tung-Sols are 12AU7 it will be quite different (than the PSVANE ECC83). Please, point out any inaccuracies you see, certainly don't want to lead anybody astray. This tube is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators and numerous industrial control circuits where high voltage gain is desired. The 6eu7 was designed to be more quiet I guess than the original 12ax7. Hoffman Amplifiers Tube Amp Forum, Which Octal equiv. You are correct that the tubes differ only in pinout. Typically these tubes will be a 12AX7, however you will also commonly find tubes such as 12AT7, 12AU7, 12AY7 or 5751, or even a combination of these such as in a Fender Deluxe which has both a 12AY7 and a 12AX7. The 6CG7/6fQ7 do sound like a 6SN7. Aug 28, 2023 · In the dynamic debate of 12AX7A vs 12AX7B, there’s no definitive answer as to which tube is objectively better. Now, what is the glass octal equivalent of a 6AU6 please? Feb 27, 2007 · Hi, I have been looking for a bunch of 12AV7's to replace the 12AY7's in a couple guitar amps. They have different pinouts to the 12XX7/ ECC8X series found in the west. Choose from U. Some of the older Fender amps like my Super Reverb has the 7025 on the tube chart instead of 12AX7. The short answer is yes in that you can swap a 7025 valve for an ECC83 and your amplifier will work fine - there are some small differences though. 12AD7: Non-microphonic/low hum version of the 12AX7 made by Sylvania and NEC in Japan. e. Since I scarfed this off an internet page, I can't say how accurate it is, and I wouldn't know anyway. Features Jan 14, 2003 · In my opinion the 12BH7 will sound much better than the 12Au7. This graph is based on the average gain and noise measured from different tube brands, using the same number Mar 6, 2021 · 12AX7 Tube Equivalents Technical information, substitutions, notes. Datasheet Specifications Part number 12AX7 Manufacturer Marconi File Size 66. Often used with series string filaments. It is a nice quiet tube that is excellent for phono stage preamps and recording studio microphone preamps. Mullard Jan 14, 2010 · Here are some 12AX7 (and substitute) tubes I've tried: RCA 7025 - a little more detail and bass speed than my stock 12AX7As 12AX7A from a Fender guitar amp made in the 70s. Let’s find out if there is any 12ax7 tube equivalent and what the difference is between ECC83 vs. Apparently The 12AX7 is the American designation, while ECC83 is the European equivalent, established by different standardization bodies. There is a less of a variety of them though so not as fun tube roll. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current Dec 17, 2017 · The difference between a 12ax7 and a 12ax7a has to do with the way the heaters are wired. Dec 7, 2021 · Ok to substitute 12AX7 for 5751 tubes in CJ Amp? The 12AT7 is a miniature, high-mu twin triode designed for use as a grounded-grid radio-frequency amplifier or as a combined oscillator and mixer at frequencies below approx 300MHz. The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. com they list them as "superior in every way" or "a step up" from the 12AX7. The 12AX7 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. The majority of the offerings are of contemporary Chinese or Russian origin and deceptively sold as rare vintage tubes, they are often marked with “military specifications” or they are gold pinned despite their NOS counterparts have never been Are you looking for the very best 12AY7 preamp tubes for your vacuum tube amplifier? This is the place to start. xsbyygt vkfx nhkbg ypfch mbqrt vunkea soh jdxlx xzb vezd