The 12AU7 has the smallest, at just 20. An old tube substitution chart I found shows subs for 12BA6: 6BJ6, 7AH7, 12BD6, 12SG7, 12K7GT, 12SK7GT, 14A7, 14H7 (with lots of notes checking or changing heater voltage, wiring and even IF re-alignment.) Ideally, every 12AX7 should yield the same gain when placed in the same circuit. The "GT" suffix would indicate a tubular T-9 bulb and an 8 pin octal base. As has been mentioned, you won't be able to get the 1 to 1.5mA needed for the 12AX7/ECC83 AND the LND150 should not be put in a position to dissipate more than 0.1 W. ••• More options. The first section of the table lists 4 digit and European types sorted in numerical and alphabetical order with USA type designations in the second column. V1 and/or V2 positions. The 12BH7 is a sub for a 12AU7 not a 12AX7! ROCKET and RHOMBUS logos are present. This tube makes a decent substitute for the 12AU7 as the characteristics are almost the same. Whenever a tube circuit is designed, hopefully the circuit is optimized for the tube in mind. Though these "12A" preamp tubes look similar, they offer different levels of gain, which means you can substitute one for another to alter your tube amp's tone and response. click here for interesting tube facts on 12ax7's: nos 60 day guarantee / used 30 day guarantee _____ vacuum tube & valve cross reference & substitution list: radio parts links! The following should be direct substitutions. The most important difference is that the 1626 has a . Though the preamp section of an amp is tremendously influential on the tone the amp produces, it's difficult to really draw many conclusions from the type of tubes being used. I d never thought that MM built these amps with 6L6, but just read in the Model Chart of this great site that these amps actually exist with 6L6!! There are several variations of the 12AX7. What types of tubes can be considered as compatible with . When in doubt, we start with Tung-Sol 12AX7.TungSol 12AX7 handles everything from vintage rock to a clean tone sound. Manufacturers. Answer (1 of 4): Hi, thanks for the A2A. With the very large number of vacuum tubes or thermionic valves that were produced and as a result of the multiple vacuum tube numbering systems that were in use, there are generally equivalents for most types of tube. Like at the -5V curve we need to write -6V etc. I have a Cayin HA-1A and which uses 12AX7, 12AU7 and two EL84. These are all pin compatible with one another, the only differences being the gain factor of each tube. This 1943 GE BELOW guide tells which tubes will swap for others and can be used to replace the ones currently installed in your radio. 12AX7. 6N2P-EV tubes are a replacement for 12AX7 in any typical amp application, but they have 6.3V heater voltage and would need a different wiring . top 300guitars.com. This base reference gives a quick way to find which tube used the same pin connections. You can fine tune your tube amplifier with one tube substitution. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. See reviews and ratings of this popular audio vacuum tube also known as a ECC83 and 7025. The 5751 is a common military-grade substitute for the 12AX7, with a lower gain output of 70. The 12AX7 is one of the most widely used double triodes in audio circuits. I want to try more options at the 12AU7 position. This data is based on my experience, and input from . The Chinese . ! Harmonically rich, with a detailed low end and a warm high end. Tube prefix . 6av6 preamp tube substitution. 12AX7 vs 12AT7 vs 12AU7: Differences Explained. Be Good Bud, kcbuck It depends on which tube you are replacing. If you need to replace your 12Ax7 tubes, you will undoubtedly come across the ECC83 tube. The status today is somewhat different, new tubes have gone incorporated into transceiver Military -EV version, long life > 5000 hrs.!!! Best 12AX7 For Guitar and Bass Amps TungSol 12AX7. 5751 tube also works great in guitar amps in place of 12AX7 to tame the gain." Quote: "Description: Low-noise Tube for Best Clean Tone! These are all pin compatible with one another, the only differences being the gain factor of each tube. The aim was to design a tube that was smaller, less microphonic, less noisy and more sturdy. Check with them first. Bestsellers. Western Electric also made WE396A which was a direct drop-in replacement for communication applications. Worldwide shipping. Ballast Tube: 2-01C: Signal Diode - one single system: 2-15A/15R-2A3: Power Amplifier Triode: 2A3H: Power Amplifier Triode: 2A3W: Power Amplifier Triode: 2A4: Thyratron Tube (Triode) 2A4G: Thyratron Tube (Triode) 2A5: Power Amplifier Pentode: 2A6: Twin Diode - High Mu Triode: 2A7: Pentagrid Converter: 2A7S: Pentagrid Converter: 2AF4: UHF Triode . You can interchange a 12AX7 with 12AT7, 12AU7, 12AY7 or 5751 as they are all the same pin structure, however they will each give you a different result in your amp. Headphone Amps (full-size) Thread starter timwillhack; Start date Oct 4, 2010; Tags headphone-amplifiers Oct 4, 2010 at 6:32 PM Thread Starter Post #1 of 3 timwillhack Head-Fier. Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. They're all interchangeable within limits. 409 People Used More Info ›› Visit site Tube Substitutions - ECC83, 12AX7, 6L6 . It draws more heater current than 12AX7. Tube Interchangability Reference. Oct 11, 2016. Though it's by no . It was specifically made for a "minimum sockets" amplifier in which the 12AX7 was a high gain . 12AX7: Acrobat PDF 65K 12AX7-A: Acrobat PDF 204K 5751: Acrobat PDF 208K 7025: Acrobat PDF 224K 20EZ7: Acrobat PDF 186K: National Valve Museum: 12AX7: html ECC83: html2: oldradio.qrz.ru: 12AX7: MK buizen handboek 6L13: MAZDA Valves & Picture Tubes Data ECC803S: html page: Frank Philipse (Pocnet mirror - Patrik Schindler) Wholesale & retail trade. In fixed bias, ECC81 can . Safe Tube Replacements Chart along with Recommendations Home. Preamp Tube Gain Factor and Substitution Chart. cb tube substitution directory 381 replacements for the most popular cb tubes by stephen dedalus, . Forums. In most cases, they can all substitute for each other. s9 cb tube substitution chart orig. The 12AX7 is a 9-pin miniature, high-mu, twin triode. A feature of a beam power tube is its low screen-grid current. If the applied plate voltage of the 6N1P is less than 130 volts, then the substitution should work OK. 6H30, 6H30P, PI, or DR is a Russian tube with no exact Western subs. These are all pin compatible with one another, the only differences being the gain factor of each tube. 09-07-2009, 07:50 PM. 12AX7.pdf (298923 bytes) 12AX7 (= B339) Marconi tt B339.pdf (68971 bytes) 12AX7 Tung-Sol tt 12AX7.pdf (155076 bytes) 12AX7 Sylvania tt 12AX7.pdf (288086 bytes) 12AX7 Brimar tt 12AV6.pdf (96362 bytes) 12AX7 Brimar tt 12AX7.pdf (1035372 bytes) 12AX7A The '12AT7′ Tube. ECC83S - 12AX7, 7025. See chart below for all the variations. 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. This makes 5751 a better choice for many high linearity low distortion audio circuit. Some people might worry about . Other substitutes in these families are (some are much more resilient and built for rugged use, called "ruggedized" in the tube field): 12AX7 - ECC83, 7025, ECC803, E83CC, 6681 (YOU . 2011-01-05 8:34 am In Transient. Post subject: 5751 vs 12AX7, Good Substitute? Russian 6N1P tubes SOMETIMES can be replaced with 6922, 7308, or 6DJ8 tubes. Supporting Member. A common substitution is to replace a 12AX7 with a 5751 or a 12AY7 to tame a preamp that tends to overdrive . There are 6N3P, 6N3P-E, 6N3P-EB and 6N3P-DR variants that went from standard to high reliability, to extreme durability. If your amp's tube chart or manual calls for a 12AX7 in the V1 position, try substituting a 5751 instead. This is the tube that all of the other equivalent tubes are based on. radio organizations and club links! However, a couple of the NOS 6SL7GT tubes had remarkably low noise, in the range of 0.65 . A 12AX7 is a poor substitute. RCA was responsible for designing and manufacturing many important valves such is the 6V6GT, 6L6GC, 7027a and the super EL84 known as 7189. Categories. There are several variations of the 12AX7. Hi there, i ve a 210/65 with EL34 tubes, but i d prefer using it with 6L6 tubes. If you use dirt pedals (fuzz, distortion, overdrive, etc.) The center tube is a real 12J5GT, while the tube at right is a correctly branded type 1626. 12AX7 Family Tube Substitution. The '12AX7′ Tube. The 12AU7 has the smallest, at just 20. The chassis is a 2275-65 w/o 12AX7 PI tube. It would have been helpful if you told us which amp we're talking about, as they certainly don't all respond to that equally. This was especially important in audio applications and was released for sale to the public on September 15, 1947. The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 12AX7 for their needs. replace with ob2 6074 6627 0c3 vr -105 5u4 u52 5ar4 5as4 5au4 5aw4 5ax4 5az4 5db4 5r4 5t4 5v4 5w4 5y3 5z4 5931 6a k5 ef95 6ag5 6ah6 (6aj5) 6ba6 6bc5 6bh6 6bj6 6cb6 6cb5 6ce5 6cf6 6cy5 6ea5 6ev5 #62 4038 1220 5590 5591 5595 5654 6096 6968 (9001) 9003 6al5 . 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. Very . ECC83S is 12AX7 high gain pre-amplifying double triode. ADVANCED SEARCH CURRENCY YOUR CART IS EMPTY. TUBE Possible substitute Western substitute EC86 6S3P, 6S4P 6CM4 EC88 6S4P 6DL4 E80CC 6N1P, 6N3P ECC82 6N1P, 6N5P 12AU7 ECC83 6N2P ECC803, 6L13, 12AX7 ECC85 6N3P 6L12, 6AQ8 ECC189 6N23P 6ES8 ECC802S 6N1P -EV, 6N5P ECC82, 12AU7WA, 6067 ECC803S 6N2P -EV ECC83, 12AX7WA, 6057 ECC960 6N3P, 6N15P E90CC ECF82 6F1P ( 6Ф1П) 6U8 ECH84 6I3P (6И3П) 6JX8 . Here's a handy chart: Primary - Products. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. The 5963 has a max plate voltage of 250V while 12AU7 has a max of 330V. Most guitar amps use some variant of a 12AX7 in the preamp section. My Favorite Tubes and Their Substitutes by Robert H. Levi. 6922: The 6922 is the up-rated version of the 6DJ8 which was made for audio tubes. 6N2P / 12AX7 / ECC83 tube Vacuum tubes, Capacitors, Nixie Tubes, Indicators, VFD display, LED, Sockets. This means that if you plug a 5751 into a socket that expects a 12AX7, the pre-amp will have about 30% less gain. COVID-19 shipping and delivery . radio repair and restoration links! The 7247 driver tube in the early Quicksilver Monos is an example of a dual in which one triode is a 12AX7 type and the other a 12AU7 type. If you really want to clean things up, replace that 12AX7 with a 12AT7, or even a 12AY7. 955 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. According to the GE technical manual, the 5751 is a special quality tube for use in critical industrial and military applications in which operational dependability is of primary importance. Interested in the ULTIMATE course for Reaper? loudthud. The 12AT7 . Russians made tubes in different grades, and 6N3P was no different. Equipment Forums. Member: Joined: Jan Thu 01, 1970 1:00 am Posts: 13626 Location: Fernandina Beach, FL I see a lot of people selling the 5751 as an equivalent or direct substitute to the 12AX7. One of the most famous American Valve manufactures of all time. Join Date . These NOS 12AX7 and 6SL7 tubes (which included RCA, Sylvania, GE, Mullard, Telefunken, and Amperex) are typically much noisier than the current production tubes tested. This is the original version of this tube. The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. Type. 12AX7 Family Tube Substitution. 12AX7 / ECC83 Comparison Chart Graph Interpretation. Electron tube Type: Brand: System: Data sheet; 6H31 : Tesla H 6H31.pdf (547400 bytes) (cs) 6H4GT Tung-Sol d 6H4GT.pdf (25311 bytes) 6H4GT NU d 6H4GT.pdf (37743 bytes) 6H5 Raytheon ti 6H5.pdf (41121 bytes) 6H6 RCA dd 6H6.pdf (44374 bytes) 6H6 RCA dd This is the original version of this tube. These are also called E88CC in Europe. A shielded cable was constructed to . The 12AT7 has similar amplification factor but vastly different plate resistance (much lower). A custom 12AX7 switching box was constructed to allow for a quick switch comparison of six tubes at a time while plugged into the V1 socket of a Marshall JCM800 2203 guitar amplifier. There are rare exceptions. Where every little thing is covered? Type. The 12Ax7 tube is by far the most popular preamp tube used in guitar amplifiers. 12AX7 / ECC83 / 5751. For this altered tube, we could just use the curve chart of a normal tube, when we lower all the grid voltages a few percent. The lower gain of the 12AT7 and 12AU7 also allows them to have a higher headroom, which can provide a warmer . I would ditch the idea of using LND150 as the current source and substitute DN2540. Posted: Aug Mon 03, 2009 2:51 pm . jazbo8 diyAudio Moderator Emeritus. You can indeed try to swap your PI position tube for something else on most amps, particularly if like in this case you go for a. This may not seem much, just -6V instead of -5V, but since transconductance of that ECC81 is 5mA/V. The 12AX7 vacuum tube was developed by RCA to replace a tube called the 6SL7. Russian 6N3P. Influence of mechanical tolerance on tube data. The biggest difference between these power tubes is the amount of gain they will provide. email us here! Preamp Tube Gain Factors And Substitution Chart . Anyway I'm a noob haven't found info.Thanks Tags: None. Share. A.F. How to use this Chart for Tube Substitution Tube substitution is difficult without special books on it. ANSWER - You can substitute a 12AX7 for a 12AT7, 12AU7, 12AY7, 5751 or a 7025. Marshall 1960B 300-watt 4x12" Straight Extension Cabinet. So I'd just look at some different 12AX7s. 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. 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. guitar and amplifier retail dealer links! 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. 6N3P-EV / 2C51 / 5670 / 6CC42 tube $ 1 . 7730. The 12AX7 is a miniature high-mu twin triode. The tube that you want to change is V1 which is the first gain stage preamp tube. I think the 5879 is similar to the EF86. Password forgotten. Photo by Andy Ellis Description. The 1626 is not a good substitute for a 12J5GT. I heard that 12BH7 is compatible with 12AU7, but Google search gave me conflicting answers: some say the pinout is different, but som esay it will work. I have brain f-a-r-t-s (dang profanity filter) quite often myself. Vacuum Tube Cross Reference Table US/Europe Models China Model Footprint Diagram (Bottom View) 1AF33 1B2 1AF34 1B2 1B3 1Z7P 1DK1 1Z1B 1DK25 1Z1B 1F33 1K2 1F34 1K2 1H33 1A2 1H34 1A2 1L33 2P2 [Vacuum Tube Cross Reference Table ]Analog Metric www.analogmetric.com 3 1L34 2P2 1R5 1A2 2S/140G 6D6A-Q 2X2/879 2Z2P 2X3 2Z2P 3A4 2P3 4L20 4P1S 5U4 5Z3P 5U4G 5Z3P [Vacuum Tube Cross Reference Table ]Analog . 12AX7. TUBE GAIN CHART & SUBSTITUTIONS *12AX7 - 100 - DO NOT USE IN AVIAN SERIES AMPLIFIERS PLEASE! Check out our course here:- http://hoppole.co/reaperBuy 12AX7 tubes from T. But what are the differences? The biggest difference between these power tubes is the amount of gain they will provide. The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. When in doubt, we start with Tung-Sol 12AX7.TungSol 12AX7 handles everything from vintage rock to a clean tone sound. 3) GZ37 (3 amp filament current) 4) 5V4G/A (Possibly lower if plate current of the power tubes is high enough) 5) 5U4/G/A/B (3 amp filament current) 6) 5R4G/A/B. an additional 5mA plate current will result! Made by VOSKHOD factory. However, different brands of 12AX7 can sound vastly different from each other. This is a premium version . The lower gain of the 12AT7 and 12AU7 also allows them to have a higher headroom, which can provide a warmer . Find the product you are looking for manufactures of all time gt & quot ; minimum sockets & quot gt! Popular as it is, most People know very little about them a different tube many tube.! 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