12ax7 vs 5751

I will also detail long vs. The phase inverter / driver position of a guitar or bass amp is a current driving position, and not part of the tone generation stage. 12AX7 is the U. 1964 -1967 “blackface” circuits AA864, AA165, AB165 1967 -1977 “silverface” circuits AA165, AB165, AA270, AA371, AA568, AC568, AA86405. Read honest and unbiased product reviews from 13. The tubes with less gain than the 12AX7 – typically the 5751, 12AT7, 12AY7, and 12AU7 – are not all compatible with the circuits designed for the 12AX7. New Old Stock in original box. 2016 · 7 Comments on Review: Yaqin MS-12B Stereo Tube Preamplifier and Phono StageTwo-Rock Amplifiers, SVL Guitars, Vintage 1961 Fender Stratocaster, Curt Mangan Strings are among the gear used by Guitar Virtuoso Matt SchofieldBruce Heran outlines the design and construction of monoblock Push-Pull EL84 (6BQ5) valve amplifiers. 02. While not really a 12AX7, it shares the same pin-out arrangement and is designed for less gain in favor of lower noise and microphonics. 12AY7 vs. But almost any 6DJ8, even at 3mA where the gm is 5,000, is better than a 12AX7, where the gm is only 1,600 full out. The main event is the "Battle of 12AX7" which is something I have tried to organise for the last two months or so. Andy After use the Telefunken 12AX7, Mullard CV4024, Amperex 7316, CBS-Hytron 5814, Amperex 6922, Tungsol 12AX7, RFT 12AX7, RCA/GE/Sylvania 5751 black plates, Amperex 6211, Raytheon 6414W, Amperex 607 . Very hard to find, this tube is Vintage and Extra Rare!Buy Mullard 12AX7 / CV4004 Tube: Acoustic & Classical Guitar Parts - Amazon. I like the 5751 in v2 of the Ghia as well as my old Z28. Only thet amplification factor is different enough to note. The twin triode part tells us that there are two identical and independent triodes contained within the one tube. GE made a fine version of this tube in their "5-Star" broadcast line. Performance", for me anyway. The most important tube in your amp? The Phase inverter! Many people think that V1 (the first gain stage) is the most important tube in an amp. 7025 vs 12AX7 I use 7025's where called for because that's what the tube chart says. 2012 · What are the right tubes for a Blues Junior? How much do they affect tone and clean headroom? Can tube wear be seen visually? Substitute for 12ax7. 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. Mullard describe the ECC83 as a high μ double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter. I get the same gain levels at 7. com FREE DELIVERY possible on eligible purchasesFind helpful customer reviews and review ratings for JJ ECC803 / 12AX7 Long Plate Gold Pin Vacuum Tube at Amazon. A 12ax7 will only dissipate 1 watt max vs 2. If anybody out there remembers, or even cares for that matter, I had been trying out several 12AX7/5751 tube replacements for my new Jolida JD-1701 tube/mosfet hybrid integrated, and have posted some impressions of the tubes as I have tried them. It does raise the headroom a bit but for me it was more of a widening of the 'edge of breakup' zone. Guitar amplifier parts, guitar amplifier tubes and guitar amp tubes 12ax7, 6v6gt, EL84 The Tung Sol 12AX7 is warm and big musically. 00: 12AX7. If your amp has too much gain, the 5751 is the perfect choice to "calm" the amp down and get more break-up without all the volume. The Genalex Gold Lion EEC83/12AX7 is my current fav and a close second Mullard 12AX7 COMPARISONS ~ Best and Worst . These reviews are a vital resource for learning about manipulating your amplifier’s tone through better tube choices. So I use NOS Sylvanias 5751 Gold Brand to bring out more lush in the mids to compensate. The 12AX7 is one of the most widely used double triodes in audio 05. i`ve been looking at forums and there are folk out there that say 5751 For example, the common 12AX7 tube has a gain factor of 100, while a 5751 tube (which is often used in place of a 12AX7) has a gain factor of 70. You might try Sovtek 12AX7LPS or NOS Sovtek 12AX7WA i only have try the last , good clean sound, In vintage i think i prefer 12AX7 RCA long black plates to almost everything, in this moment. 5751 - 70 (this is designed to be exactly equivalent to the 12AX7, except for the gain) 12AX7 - 100 (other related 12AD7, 12DF7, 12DM7, 12DT7, 7025, 7729) ECC807 - 160 (the highest gain I am aware of in a 9A twin triode) 12AX7 vs. With 30% less amplification than a 12AX7, but 100% interchangeable, 16 Jun 2016 I have a NOS USA GE JAN 5751 for V1 in my '68 CVR. Comparing those two tubes in both theory and practice, as I did in 1978, we discover that the ratio of gm is 12,000/1,600, or 7. JAN-5751: This tube has a *very* nice midrange sound, and is very quiet. The Sino 12AX7 / ECC83 is a greatly improved version, is a cost-effective and suitable replacement for any 12AX7 / ECC83. ? Tube Basics and FAQ Grading and Matching Vacuum Tube Warranty & Return Policy Cryogenic Treating Tube Testing Equipment Why We Don't Sell Certain Brands 12AX7 vs 12AU7 Discussion in 'Amp Input - Normal or Bright' started by Class A Knob, Mar 7, 2018. [12ax7] The JJ Tesla ECC83-MG is well made, low in microphonics with a thick glass envelope. After installation it sounded too distorted and muddy so looked closer at the tube I had re4moved and realized it was an ECC83-WA not a 12AX7. Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. KCA NOS Tubes. The clean channel has a bit more sparkle but the gain channel is where the real magic is. I bought 3 12AX7 Chinese tubes for my Fender Hot Rod Deluxe amp. It is currently re-branded by several companies such as Ruby Tubes, Groove and others. The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. 2009 · Keep in mind that if you do decide to replace the 12AX7 tube you should give the pedal some time to break in. It has black plates, triple micas, and a windmill getter. Telefunken ECC803S (E83CC) In my opinion these are simply the best. All tubes, whether it’s your amp or a 12AX7 & 5751 Tube List. I don't find the 5751 always delivers good sonic results as a sub in a circuit designed around 12ax7, in fact, usually the opposite, but that tube sounds great to me. Thus, substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. 00 Ive been doing an awful lot of research and talking to some friends, and amd wondering what other folks experiences are regarding the pluses and minuses of substituting 5751s for 12ax7s specifically in preamps. Read our reviews or we'll help you with a recommendation. com/articles/preamp-tube-gain-factors-and-substitution-chartPreamp Tube Gain Factor and Substitution Chart. There are 2 to 3 different ones out there. RCA 12AX7's, 17mm, black plates from the 1950's…$95. You could substitute a 5751 with a 6SL7,though. 12AX7 Basics The 12AX7 is a 9-pin miniature, high-mu, twin triode. The Psvanes are the equal of the most recent (RCA black plate 5751’s and prior to that Real TungSol Long Gray plate 12AX7’s) and easily outperform all other current production and some late 50’s RCA long gray plate 12AX7’s. However, the plate resistance and transconductance are such that this tube makes a good substitute for type 12AX7. 12ax7/7025 has a gain factor of 100. That said, I only have ever had one much-talked-about Raytheon windmill getter 5751. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940’s. Every twin triode is esentially two tubes in one. It has a gain of 70 instead of 100 like the 12AX7 but unlike the 12AT7, the 5751 has the same Rp as the 12AX7. Tung Sol, with the old white labels or OEM labels from the 1950s, identical to the Command series listed below, at a savings! HiFi Tube Amp Kits; Elekit TU-8600 300B SE Tube Amplifier Kit - Limited Run; Elekit TU-8200DX Stereo Tube Amplifier Kit; Elekit TU-8200 Stereo Tube Amplifier Kit With 30% less amplification than a 12AX7, but 100% interchangeable, an amp using the 5751 preamp tube creates a creamier and smoother tone than with a 12AX7. grey plate The whole line of RCA tubes both long and short plate grey plate tubes do sound slightly "rounder" than the black plates with the square getter that is at a 45 degree angle. Comparison 12AY7,12AX7 by Electro-Harmonix 5751 by Groove tubes guitar;  Dr. 2009 · filament, heater consumption and power output from EL84, 6V6, 5881 in Fender Blues Junior with Billm mods04. 05. Sound differences of preamp tubes in a Carvin Vintage 16 guitar amplifier in V1 position. Telefunken 12AX7 versus Sovtek 12AX7LP and 12AX7LPS. The higher valued resistor should offer a hint more gain, at the possible expense of a little more noise due to drop across the resistor. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. 06. Theoretically, the 12AT7 will give you marginally more headroom, but your amp may respond to the tube differently than you might expect. 1978 Fender Twin Reverb - GE 5751 preamp tube in V1. If your Blues Junior breaks up too readily and you need a bit more control over clean headroom, the 5751 is a good choice for V1. To lower it even more but retain the same performance characteristics (other than gain) you can use a 12AY7. The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, Nov 4, 2016 12ax7 / 7025 / ECC83, 100, 62. These are all pin compatable with one another, the only differences being the gain factor of each tube. 12AX7 is a miniature dual triode tube with high voltage gain. In my experience the 12Au7's lowered the gain a little too much. I’ve been curious about the new 5751 from JJ since I heard about it a few months ago. At a high volume level it's about perfect for my sort of jammin but when I put my TS9 and Fuzz in front the distorsh is too much. 12AX7 & 5751 Tube List. Good luck in your search. Tung Sol 12ax7 vs Jan-GE 12ay Equipment: Ceriatone JTM-45 with JJ 12ax7 in V2/3, Gold Lion power KT66, & TAD GZ34 rectifier tube Marshall 2061cx 2x12 cab with stock 70th anniversary G12h30 Transconductance on a real 5751 is about 1200. They all do the same thing which is to amplify a smaller signal into a larger one. We burn-in, test, and match all of our Sovtek tubes. It also works well as the second preamp tube (it's a bit warmer than the Sovtek 12AX7WB). Matching Where Aailable Is $10 Extra Per Tube. 5751 are a lot more 'musical', less brittle to my ears. The following grades are available in all dual triode types. If someone's got the ears to hear 12AY7 vs 12AX7 vs 5751, imo what's needed is a better amp. Whereas, the 12AU7 has a moo of 20; the 12AT7 has 60 moos; the 5751 has 70 and the 12AX7 has 100. 配俄罗斯 6л9 x2,可直换 2018 – 20th year of chrisguitars. 5751's are tough tubes (the old stock ones at least). This 19545 military spec GE 5751 tube is a lower gain 12AX7 equivalent. RCA 5751 are good, the better have 3 mica. Comparison 12AY7,12AX7 by Electro-Harmonix 5751 by Groove tubes guitar; Squier Classic Vibe Telecaster '50s no stompboxes. When you push your amp hard it is not as much the output tubes distorting as it is the Matched RARE Western Electric CK-5755 tubes in pairs. Vintage European and US 12AX7, ECC83, 5751, 7025, CV4004, CV492, and M8137 tubes in stock now, fully tested and guaranteed. Of course there is a difference, a 12ax7 is not the same as a 5751. Made in Russia. High gain, super low microphonics, and superb linearity with a three dimensional tone. I've always wanted to do a review of 12AX7 tubes but felt that there were too many variables. 2018 · I'm not really a NOS tube Guy, they lost to "Cost vs. Please Inquire About Matching. If you are running the Tonelab in an effects chain this is a great thing. Thus it is going to be closer to a 12AT7 (gain of 60) in terms of gain than a 12AX7 Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. ask. 12ax7, Ecc82, ecc81, 5751, 12au7 and many supplied tested and graded (see options on the valve page). tube specs: 12at7 / ecc81: 12au7 / ecc82: 12ax7 / ecc83: 12ax7 / ecc803s gold: 5881: 6550: 6l6g: 6l6gc str: 6sl7gt: 6sn7gtb: 6v6gt: 7581: el34b: kt66: kt120: kt150 A 5751 and 12AX7 are much more closely related than the 5751 and 12AT7. Petersburg (Winged "C"/SED) tried to develop a good 12AX7 and mostly failed. I have the Sylvania 7025's, as well as Bugle Boys, RCAs, Raytheons, as well as Mullard CV4004's - and they are all good, but the 5751 is just better suited for headphone amp use IMO. To my ears the differences are more signifcant in terms of "bite", midrange texture, and overall sweetness. Find great deals on eBay for 12ax7 tubes. The following should be direct substitutions. 2 and -16. 5751 has gain factor of 70. Popped it in the phase inverter spot of my ValveKing and man, what a great move. Normally, in BF or newer (including the Hot Rods) a 5751 is about as low as you can go and still drive the power section decently. The JJ ECC83-MG has a short plate and great for reduced microphonics. Tubes with lower gain also usually have lower impedance. If you were looking for a tube electrically equivalent to a 12AX7 with lower gain, the 5751 is what you're looking for. Or the lower gain ECC83/5751 G. Production years. Would that mean a 5751 would only put out 70% of the volume in the same circuit? The more non-technical the explanation, the better. If you are looking for NOS tubes for your Hifi audio system, guitar amplifier, or tubes for other types of vacuum tube gear, we probably have it in stock! If Not tried in a BJr before. a 12AX7 in the same slot 12AX7/B759 - Genalex Gold Lion, Gold Pin - Genalex Gold Lion ECC83/B759 (12AX7) dual triode preamp tube with gold pins. Vintage 5751 tubes from USA and Europe. This is the ultimate preamp tube to use in critical gain stage applications, particularly in first stage/input positions or other high gain stages in the You might be better off sticking with a 5751 if you want less gain than a 12AX7. A 12AX7 has a gain factor of 100, whereas a 12AT7 has a gain factor of 60. 5F6A major components: First tube the 12AY7/6072 preamp or the 12AX7 or 5751 voltage amp, Second and third tubes are 12AX7 drivers. 75 watts max for the 12au7. 5751 Tube Review. Tube Test - 12AX7 Tung Sol Reissue This was the last run in January 2012 of the Tung Sol Reissue that I performed at the request of Dan Boul over at www. A very toneful and harmonically rich pre tube is the Jan Phillips 5751. Z Carmen Ghia through a "cheapo" 1x12 cabinet (with alnico speaker) from Ruby Tubes. 12AV7's in Tweed Champ: what changes in tone? A 12AT7 is a drop-in replacement for a 12AX7 in most cases (but not the other way around). To lower the gain of a preamp stage a little, you can swap a 5751 into any socket that carries a 12AX7. Z MAZ 18 NR 5751 phase inverter tube vs 12ax7 - YouTube www. Be aware,though,that using directly a 6SL7 instead of a 12AX7 it's not the best move. The Ultimate 12AX7 enhanced with Gold Pins. The G. The 6N2P, (Russian: 6Н2П), also sometimes spelled in English "6H2Pi", is a miniature 9-pin dual triode vacuum tube manufactured in USSR, Russia and China with characteristics similar to the RCA 12AX7. E 5751 is simply a superb valve which showed all the G. HiFi Tube Amp Kits; Elekit TU-8600 300B SE Tube Amplifier Kit - Limited Run; Elekit TU-8200DX Stereo Tube Amplifier Kit; Elekit TU-8200 Stereo Tube Amplifier Kit 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. NOS/NIB Preamp Tubes. Mullard 12AX7 / ECC83 - Price of NOS 12AX7s got you down? This new re-issue of the famous Mullard 12AX7 made in Russia is the answer to your woes! Very low noise and microphony make this tube an excellent candidate for many touchy preamps and phonostage applications. I've used two of the same nice pricey 5751 in v1 and v2 and thought it sounded worse than using a diferrent (albeit a pretty nice 5751) preamp tube in v2. 12AX7 Family Tube Substitution The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. com/youtube?q=12ax7+vs+5751&v=2wCSvQ826Ls Aug 7, 2011 Test of using a JAN Sylvania 5751 in the phase inverter position versus the stock Sovtek 12AX7 LPS. There is a 12AX7 tube that's right for your gear in our vast selection! There are more differences between a 5751 and a 12AX7 than just gain - the 5751 seems to be very difficult to overdrive (in a good way) and the triode halves are reputedly very balanced, which may be an advantage as a PI. This I feel is next audio valve which a few years from now will get more and more sought after and more expensive. a 12AY7 vs. The 5751 is a military spec tube, with a gain of 70, vs the 12AX7's gain of 100. Please see the substitutes at the top of the page for more details Derrick, you really should try swapping in good quality 5751's for the 12AX7 (although not in any phono section). 12AX7 6AX7 Author: Sylvania Subject: JA-FP-2002-03-23 Created Date: 3/24/2002 12:54:30 AM Real tube distortion with 12AX7 / ECC83. I have the same 5751 in a couple of amps. Note that matched pairs of 12AX7 are not required for guitar amplifiers. NOS/NIB Rectifier Tubes. 12AX7 and 5751 (equiv. There are amps that like it better than others. It was developed around 1946 by RCA engineers [2] in Camden, New Jersey , under developmental number A-4522. However, it really must be an NOS 5751 you can get the JAN Phillips or GE 5751 relatively cheap I think. Interestingly, Sylvania, the other first-tier American Tube manufacturer, made only a long-plate 12AX7A that had more ribbing and reinforcement than the old long-plate. You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube Data Page. 5751 tube also works great in guitar amps in place of 12AX7 to tame the gain. I have looked them up in the RCA tube manual and while they look quite close, the 5751 has a slightly higher filament current, if I read it correctly. A 5751 and 12AX7 are much more closely related than the 5751 and 12AT7. 100 for a 12AX7. Longlife 10. For me, the magic tube in V1 (or V2) if you want to lower the gain a bit but retain the great tube tone is a 5751. The 5751 is so close the 12AX7 that the specs fall within the +-20% rating variances of the 12AX7. Its got the 5751 sense of focus in spades, is clean, open and evenhanded in frequency response if just a little sweet on top. 5751 tubes are generally made to industrial standards and are found with both double and triple mica. Thus it is going to be closer to a 12AT7 (gain of 60) in terms of One of Stevie Ray Vaughn's favorite tubes was the 5751 preamp tube. So, what tube do you guys think would be best for me? My idea is to put it in the v2 for a little less gain and a little warmer sound in HDR, 5751 vs 12ay7 vs 12au7. At the music store a cleark gave me a 12AX7 tube. Free shipping on orders $105 and over. Tested en matched on Amplitrex AT1000. 5k, Classic preamp tube sound; most output. Yes, a 12AX7 and a 12AU7 are interchangeable. Find great deals on eBay for 12ax7. These are a slightly lower gain tube that can be used as a replacement for. Matter of fact both tubes share the same production methods and materials, were the 6072a is related to the 12AY7 and the 5751 to the 12AX7. I tried a 12AX7 in the Mini Torii with 6V6 power tubes. Please see the substitutes at the top of the page for more details Common 12AX7's have a gain of 100 and 5751's have a gain of 70 which is much lower than a 12AX7. Clean tones with this tube had very little harmonics, and practically no discernable chime. They may not sound exactly the same, but there is a family tonal character, like the Raytheon blackplate 12ax7 rectangular getter, 5751 blackplate windmill getter, and the triple mica 12at7 red print exhibit. 12AX7 is a high gain tube that provides the wonderful tube sound with warmth in harmonics in many tube amps. This Vacuum Tube Retainer for small 12AX7, 12AT7 and 12AU7 tubes is only necessary if tubes are mounted where vibration may cause them to work out of the socket, but if needed do provide a hold down for loose stabbed sockets. com/youtube?q=12ax7+vs+5751&v=hhTLsdVaADw Jan 22, 2011 First pre-amp tubes 12AY7,5751,12AX7 changing test. I'd just wish it had a little more gain - I can always reduce gain with something else, like an ECC82 or ECC81, but I'd like to see this midrange tone and low noise performance on a higher gain tube. Audio tubes for guitar amplifiers and audiophile equipment. An entire chapter is devoted to sculpting the dynamics of overdrive and harmonic distortion. Call now! 516-314-0357. 01. I have a 5751 in place of my 12ax7 and the manufacturer of my Octave states the 12au7 can be used in place of the 12at7's. 300guitars. There are different tonal characteristics from each tube. I assume its the top and bottom area that holds the internal parts together. Never tube rolled before, don't quite know what to expect sound-wise. Raytheon, Sylvania and GE blackplates are the first choice, but some prefer any 5751 to any 12ax7 so you never know until you try. The best lower gain sub for a 12AX7 is the type 5751. anyone know what these designations stand for? The lower gain (and almost 100% of the time lower noise) of the 5751 is a huge benefit in a headphone amp application versus a 12AX7. Re: 12AX7 vs 12AT7 vs 12AU7 Originally Posted by lovechild 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). A bit better than the NOS GE 5751, but not in the same realm as even the NOS Tung Sols. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound. black plate. DIY Guitar amp (12ax7 el84) DEMO. Read up on them first and check out reviews. 5 on the dial vs. Swapping the EH 12AX7 for a very expensive Telefunken just muddied up the midrange and switching to a Mullard slowed down the presentation and increased background noise. 7025 and 5751. 5751 Tubes . The ECC83 (12AX7) valve is used in the preamplifier section of 99% of all valve guitar amplifiers. About Hi Test. 12AX7 vs 12AT7 driver. G. 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. The white print on the glass has the GE logo and reads "JG-5751" (partial). Early production 5751 have extra thick mica spacers (often three know as triple mica) and extra support rods to minimize microphonic response. The Sovtek 5751 is an affordable alternative to the 12AY7 used in original Fender tweed amps and can be subbed for a 12AT7 reverb driver tube. 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. com www. Finding real Mullard ECC83 preamp tubes is hard enough, but finding a consistent source of quality Mullard tubes is next to impossible. BUT, if you liked the 12AT7, then try the 5751. com. Updated: TGIF, Nov 2nd Frank's Electron tube Pages - Tube type List「いい音を求めるなら、部屋が良くないと始まらない。 大金をつぎ込んでターンテーブルを買えば音がよくなるかというと 12AX7 & 5751 Tube List. Contact Information. Also, one need never use all one type of tube in a preamp (like all 7025, for example), nor do they need to be the same manufacturer's tubes. it haves less gain than a 12AX7 from Electro Harmonix, 12AX7LPS, JJ ECC83S etc. These tubes are still plentiful, and are really well made. The 5751 is the easy answer. makes the crazy effects chill out and enhances the dynamics of the clean models. It's best to stick to the 12AX7, 5751, 12AY7, 12AU7. Articulation is excellent, though not as detailed as the TungSol. I personally don't like the way they sound in a Marshall, real bland. ) typically reduces circuit gain by 28% and slightly increases BW by 4%. The tubes reviews on the net said these were ok to good quality. . Original Genalex Gold Lion ECC83/B759 tubes are considered among the best 12AX7 types ever made. 65amps. They're more popular with harmonica players, being wery low gain like the 12AU7. I felt that the gain was too much. ” Read “Very sweet, warm vocals. I tried a 5751 tube (70% gain) in my twin and the result was just earlier power tube distortion. Radio tubes are valves. I used 4 x 5751 to tame down a 100 watt guitar amp. Long & McQuade is Canada's biggest music store offering a huge selection of preamp tubes & much more. "Ei-RC" - Electronic tubes factory Data Sheet ECC83/12AX7 Page 1 of 4 ECC83 is A. 5751 type Tung Sol long greyplate, Premium industrial grade 12AX7. 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. These are all pin compatible with one another, the only differences being the gain factor of each tube. First pre-amp tubes 12AY7,5751,12AX7 changing test. And no fizz! I was a bit worried that it might sound less dynamic or harmonically rich than other tubes in the JTM45 and JMP settings, but it exels there, too. As far as pin outs are concerned the 12 series tubes are all interchangeable. A tube I thought is better than the 3rd place Mullard 12AX7 round plate are the Raytheon 5751 windmill getter. -open back 1x12 cab with WGS Reaper  Preamp Tube Gain Factors And Substitution Chart - 300guitars. 12AX7 Tube Review . I'd suggest trying a 5751. It's not possible to generalize one as better than the other. There is one that has nearly the same gain as a 12ax7. 7025 is higher in gain and a bit brighter then the 12AX7. Here is a quick comparison of new 12AX7 tubes tried recently. The 12AX7 has the highest gain at 100, the 12AT7 is lightly lower and the 12AU7 is the lowest gain of the group. I have experienced a problem with some tubes that create hum at around 1000 hz and below, I wonder if this characteristic is considered a noisy tube Nuvistors. haven't had a tube amp in years and read reviews about Electro Harmonics products. Also, I wouldnt' recommend using a 12AX7 in place of a 12AT7 in a reverb driver. The Mullard 12AX7 long plate square getter is the best I ever heard. The Mini Block tube amplifiers use a 5751 in the driver position This is our "audiophile" tube page. RCA 5814 Black Plate 2 Mica NEW (NOS) These are of similar construction to the famed 5751 which is the 12AX7 equivalent. The VAC is transparent and is quite good pinpointing instruments but will emphasize the highs. 5814's exhibit superior performance for noise and microphonics. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. The current production Svetlana is a New Sensor product and is a member of 12AX7-EH and Tung-Sol 12AX7 family. to ECC83, 12AX7, 7025) All of the 12AX7 types listed may be used to replace 7025 or 12AX7A. 12AX7 Family Tube Substitution. This means Нашел интересную ссылку Вкратце смысл такой: ЛЮБАЯ 12AX7 сливает ЛЮБОЙ 5751. A VAC Standard that runs on 12AX7 (5751) tubes and CJ Premier 16 that runs on 6922(7308). For me it was a good way to pull a little gain out. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. All these tubes are interchangable and all have the same gain structure. 12ax7 vs 5751 Mook's Taste Test for 12AX7 INTRODUCTION: I tested 10 different kinds of 12AX7 pre-amp tubes using a Dr. have a different spin b/c of the nature of a power tubes vs preamp tube?Sep 20, 2012 I've been considering getting a JAN Phillips 5751 for some time now to It is supposed to be about 40% less gain than the JJ 12ax7, while the 5751 is supposed to be about 30% less gain than the 12ax7. I have always thought the current production 5751's sound like a weak chinese AX7,perhaps the AY7's are the same? Tests 1800/1775 The 5751 often is sold as a sub for 12AX7 tubes albeit fine in some scenarios they are excellent replacements for 12AT7 & 12AY7 tubes because of their gain factor. Double Triode Quick reference data • Anode current Ia=1,2mA • Transcoductance S=1,6mA/V To reiterate: 5751 is a lower gain sub for 12AX7, and 7025 is a low-noise 12AX7 (same spec). RCA 5751. It worked well in both test amps and can be used to advantage if your amp has too much grind. In hifi preamps and CD players, the JAN-Philips 5751 will lower noise floor and sound smoother and clearer in place of many 12AX7 tubes. It's also between the 12AT7 and 12AX7 as far as gain. The only way to know if the 12AT7 will work for your situation is to try one. This tube is a reproduction of the highly regarded and sought after Mullards from the 1960s. com This is the current "Tung Sol" tube from New Sensor. Top end was brittle, even with the treble rolled back, and the overall sound was very closed and two-dimensional. 12AX7 datasheet, 12AX7 circuit, 12AX7 data sheet : GEC - TWIN TRIODE ,alldatasheet, datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Dual Triode Grading System: All RAM Tube Works dual triodes are tested and graded using our proprietary tube testing computer developed by Roger A. E. 7 Jan 2018 What are the benefits and downsides in terms of both tone and feel from using lower gain preamp tubes like 5751 and 12AU7 in V1 and/or V2 what i`d like to know is which are the better tubes, 12ax7`s or 5751 tubes. Shop online today! RCA 5751 - 12AX7 - ECC83 Black Plate Triple Mica - RCA 5751 - 12AX7 - ECC83 Black Plate Triple Mica Its all very subjective,but I think the difference between a 12AY7 and a 5751 is wider than between a 12AX7 and 5751. From left, RCA 5751, Sovtek LPS, Tungsol re-issue, Psvane, GE Triple Mica Black Plate 5751. The 12AX7 is a high-gain (typical gain factor 100), low plate current triode, and is therefore best suited for use in the preamplifier (input and mid-level) stages of audio amplifiers, guitar amps , mic preamps etc. Now there is an exception, the 5751 was designed to have a mu of 70, and a plate resistance identical to a AX, the 5751 tube was specifically designed to be a lower-gain, plug-in replacement for the 12AX7. So I'm looking for a bit more clean headroom in my (1) 12AX7 and (1) El84 amp. 000 hours. Seller stated Telefunken 803s are not as good at $1K+ each. Response: In the old days the 12AX7 and 7025 were different quality tubes. short plate and gray vs. FYI, a 5751 has more gain than a 12AY7, 70 vs 40 for the AY7. Gain is 60, vs. The 12AU7 is not considered a satisfactory replacement for a 12AX7 or a 12AT7. A fun thing to do on a rainy weekend is to pull out 3 or 4 12AX7’s from different manufacturers, and a couple of 5751’s and 12AT7’s. This is a question that has popped into me head over the years so I figured I'd bring it up. Tube Interchangability Reference. . 5x higher for the 6DJ8. I see a lot of people selling the 5751 as an equivalent or direct substitute to the 12AX7. shootout. Close but no cigar. I'd be willing to sell some of the more expensive tubes as singles + $5 shipping CONUS (outside of CONUS, shipping cost will vary). And as for the cryo tubes, magnificent, try them out. The voltage gains are thus -32. They are interchangeable, though the 5751 has a gain rating that's less than the 12AX7. 5751's have about %80 of the gain of a 12AX7, 12AT7's have about %70 of the gain of a 12AX7 ect. 12ax7's - Mullard vs Brimar vs Amperex The Eden forum is provided by Eden for Musicians, the views and opinions contained here are of individual users are not endorsed or approved by Eden or any of its employees. Very consistently made tube. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. Re: 12AX7 vs. the 12AX7. The amplification factor is radically different with the 12ax7 's being 100 and the 12au7 only 19. Nuvistors were the latest tube development at just about the same time as the introduction of the first integrated semi­conductor circuits. I ended up going back to a 12ax7 and using the 5751 for the guitar channel. I don't like Mullard 12AX7 preamp tubes (Page 1) — Joe's Guitars, Amps and Gear — Joe Bonamassa Forum — The official forum for all things Joe Bonamassa, guitars and blues music The 12AX7WA is made by sovtek it sounds o. The ECC83 MG is a “Mid Gain” 12AX7 type tube. 12au7's were a bit too low gain, but the 5751's sound great. Dom i got a mullard 12at7 for my phase inverter recently. A Comparison of Current Production 12AX7 Tubes by Kurt Prange. 12AX7 Jj - 232 results from brands Amplified, JJ Electronic, Vox, products like 12AX7 set, one EH and one JJ, 12AX7 Mini Sampler Set (JJ, EH, Tung Sol, Ruby, Sovtek), Tube Complement for Rivera TBR-3 Hammer 120 . and 7025 is the industrial name. 12AX7 is about 1600 (for a proper tube) 12AT7 is 5500 so even though the gain is close to a 5751 they act very differently. Also you might want to try a 5751 in your CDP. They are 30% less gain than the 12AX7, and are (typically) quieter and less microphonic. ECC83/ 5751-JJ TESLA JJ Tesla The JJ 5751 is a low gain version of the 12AX7. Triple mica construction. Top: to do an A/B comparison of a 12AT7 vs. E character but with lower distortion levels than the G. The Carvin Vintage 16 was chosen because it has a simple 12AX7 vs 5751 This directory contains USENET articles Mic has saved about guitars, equipment, pickup, techniques, players, and so on. RCA 12AX7 RCA NOS LONG BLACK PLATE 12AX7 OUT OF STOCK 12AX7/A RCA NOS 1960s production grey plates $60 OUT OF STOCK ANOS 12AX7A RCA USED TESTED $25 5751. One of the best replacement tubes for a 12AX7, ECC83, 5751. 5751 GE Black Plates and triple mica 1950's (very good midrange detail, good bass, sweet sound, one of the best sounding 5751's ever made) TO BUY 5751 GE black plates One tube to look at is the 12dw7, half 12ax7 and half 12au7. The 5751 is a mil spec tube that is the same as a 12AX7 but more solidly built and at a lower gain for less microphonics. spax7 preamp tubes MESA® SPAX7 preamp tubes are a premium grade 12AX7 that possess an even higher standard of overall performance due to their incredibly low sensitivity to microphonic noise. Then because the microphonics were high they changed to a short plate that is 1/2" and this helped to quiet them down some. Just grabbed a JJ 5751 from the tube store. 12AX7 vs 7025 This directory contains USENET articles Mic has saved about guitars, equipment, pickup, techniques, players, and so on. All new tubes had at least 20 hours of burn in time on them. E although this I m told will emphasis the top end of the frequency range and finally throw away the 6L6WGC s, use EL34 s and live with the reduced life expectancy (I assume he was talking about the tubes). It warms up the tone, and lowers preamp gain about 30% so you can rely a bit more on the power amp tubes for that classic "tube sound". А что может сказать наша общественность?8 май 201822 янв 201110 Dec 2010 The 5751 is a military spec tube, with a gain of 70, vs the 12AX7's gain of 100. We will stick to the basic 12AX7 and 12AT7. In its day (it was introduced in the mid '50s) the 5751 was created as premium 12AX7 designed by US manufacturers to overcome the well known limitations of American made 12AX7s, specifically: huge sample to sample variability, microphonics and noise. what does the b stand for? ive noticed there are other tubes marked 12ax7a as well. F. 1, respectively, depending on which input is used - 12AY7 or 6072. 5751 is the way to go. The EL34, EL37, & Mini tubes 6DJ8, 12AX7, 12AU7, etc are some of the longest – lasting, toughest, finest sounding tubes ever made! Mullard is one of the few tubes that have the almost magical ability to separate the noise from the music, and the ability to present the two in different places on the soundstage. All tubes, whether it’s your amp or a . The 12AX7 will have the most gain and the 12AU7 will have least amount gain. ECC83 is the british name for a 12AX7. 12AT7 phase inverter, clean rhythm by Jolo Carrera published on 2013-02-05T17:31:34Z In vacuum tube amplifiers, the preamplifier tube closest to the output tubes is known as the phase inverter. It is kind of like using a 5751 in place of a 12AX7--the lower gain being the main difference. The 12AT7 can also be substituted with a 5751 tube which has a gain factor of 70. It’s interesting to note the 12AU7 actually predates the 12AX7 by a few years. The usual subs for a 12AX7 are 5751, 12AY7, or 12AU7 in order of decreasing gain. The 5751 is kind of an odd ball tube, most of them were JAN tubes. There are many tubes today that state that they are close to the original sound or construction of the older Telefunken tubes and Mullard tubes. Great tube replacement for a standard 12AX7, especially when you want to tame down a dirty preamp channel for more crunch and less bite. A comparison of 11 preamp tubes 12AX7 / ECC83. If you look at the landscape of 12ax7/5751 tubes, this one will stand out buy it’s unique sound and unique looks. My 12ax7 preamp has 5751's in it. SPECIAL OFFERS. This is very popular in Marshall, Mesa Fender and Vox amps. Mic up your favorite amp and kick on the 4 track (or computer based recording system of your choice), play a tune and record 30 or so seconds of it. Modjeski. This 7025 is a high quality and very rugged custom 12AX7 tube produced for us in China by the Shuguang factory. Usually there are between 2 and 5 of these valves in the preamplifier section. We just completed another tube and hifi shoot-out tonight at my apartment. I am mainly going to cover 12AX7/ECC83 , 5751 , 12AU7 pre-amp tubes and EL84/6BQ5 , EL34 and 6L6 power tubes, since these are some of the most popular and in demand tubes for guitarists and audiophiles. Another thing to consider is the height of the pickups. 027: JJ 12AX7/ECC83 Nice sounding modern production tube from JJ with small JJ plate structure Small plate: $12. I've got a variety of NOS and ANOS (almost new old stock) tubes for sale. The 5751 has virtually identical electronic specifications as the 12AX7, but it only has 80 percent of the gain. It may also be related to the ruggedized 5751 which came out around the same time and had the short-plate structure. There's also the 12AV7 and 12AZ7. The 5751 has identical plate resistance to the 12AX7, but the gain is 70 compared to 100 for the 12AX7. Click to expand So, by what your saying, my ears are working too well and my Twin Reverb isn't good enough. JAN-Philips 5751 Review. I believe the 12AT7 has a mu (gain value compared to 12AX7) of 60; whereas the 5751 has a mu value of 70. Michiel , about 5751, have i got to make all a set of these ones, or is there a particular way to use, i mean maybe one 5751 on V1 and the two others in 12ax7? About 7025 , i m maybe wrong but i remenber my old silverface twin had that kind of tube? 12AX7 / 12AX7A / 12AX7WA GE 1965-1982 (Also see 5751, 5751 is a direct pin replacement for 12AX7/A, but mu is reduced from 100 to 70) - Fender Champ Reissue 1957 - Fender Deluxe Reverb 1964 - PrimaLuna ProLogue Five Integrated amp TO BUY 12AX7 and 12AX7A GE Battle of 12AX7. 12ax7 vs 5751what i`d like to know is which are the better tubes, 12ax7`s or 5751 tubes. In this application, you will get good gain with a warmer sound than the 12AT7. 11, and it's less compressed and more muscular at the same time. Testing completed at Guitar Amplifier Blueprinting 3/4/02. The first EH 12AX7's were the exact same plate as the LPS which was 5/8" long. The Black plates have more chime and top end sparkle. Loading Please wait My Account; Order Status; Wish Lists; View Cart ; Sign in or Create an account The ECC83 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. A quick glance and you might think they were all the same but careful inspection reveals physical differences in construction and plate coatings. A 12AT7's have a gain of 60 and are typically used in Reverb circuits for being able to drive high currents that the reverb tank needs. Can someone explain to me what is triple mica when referring to 12AX7's and 5751 tubes. gain is I'm wanting to convey. ?. When you push your amp hard it is not as much the output tubes distorting as it is the phase inverter breaking down and distorting. 5751, 70, 58k, Smoother; good mids and bottom. I also didn't trust my ears to be objective for long enough to really test all the different models available on different amps etc. It is a long page, use your scroll button and scroll down the page to see it all. 12ax7 vs 12at7. I first tried it in my early 90s Peavey classic 20. 5K 25µ 6. Title: JJ 5751 Datasheet 2012 Created Date: 3/8/2013 10:20:01 AM Tube 12AX7 or Röhre 12AX7 ID3730, Double Triode, Noval, B9A and Audio Frequency shown. tung sol makes a great one. Most hi-fi, amp, guitar amp, and stereo tubes we 音色甜美温醇,音场的动态感和力度感都有出色的表现。 配贵族 300b x2, 配俄罗斯 6r2 x2, 可直换6g2p,6sq7. E 12AX7. NOS/NIB Power Tubes. The Preferred Series 7025 is a high quality 12AX7 tube type. The 12AX7 makes a really nice initial preamp tube that is a little bit "sweeter" than the Sovtek 12AX7WXT+. Test of a Fender Hot Rod Deluxe with different driver tubes (V3). Personally, I don't care for 5751's and I have about 5 of them that never make into any amps I have. In fact, all of the following tubes work where a 12AX7 would go: 5751, 12AT7, 12AY7 and 12AU7. Nice middle of the road tube as far as gain is concerned. I get that a 5751 has about 70% of the gain of a 12AX7. What say you all?I've not really seen much of a mention of the 5751 when it comes to bass gear to be honest - and it's gain isn't that much below a 12AX7. Finally, Ned's schematic states "5751 or 12AX7" for V1. Those tubes have a strong family tonal resemblance for sure, even though they have different designations. Mic has graciously granted permission to post the stuff on the JT30 page on the off chance that it might be useful in the context of Blues Harmonica. In one of my amps, I've tried all sorts of preamp tubes, from the 12AX7, for which it was designed, to the 5751, all the way down to 12AY7 in an attempt to get clean headroom. Big, warm, and musical. S. Use the Matched 5751 tube in any application where a phase inverter / driver 12AT7 (Slightly higher gain) or 12AX7 (slightly lower gain) tube is specified. I also tested them in my Champ and they made it have a tone more reminiscent of the classic bigger Fender amps. k. Anyway, I can't see much difference in 121K versus 150K. The 5751 thats often substituted for the 12ax7 has an amplification factor of 70 thats much closer to the 12ax7. And, Im still making adjustments depending on how the volume vs. It looks like an average 12ax7, except for a thicker mica, but the sound is quite different compared to even 12ax7 Tung-Sol. Hello Guys, the 5751 belongs to the same specialty tube series as the 6072A. 12AX7. Next tube I'm looking for is a box plate Mullard 12AX7, and then maybe a vintage Tung-sol 5751 and/or Mullard 12AT7. All tubes, whether it’s your amp or a 07. Re: '50s - '60s RCA 12ax7s - black vs. The TJ was a much different story, this tube showed an improvement across the board. 5. By my count we have the Sovtek 5751, Sovtek 12AX7 LPS, Mullard and now the Gold Lion brand. Shop with confidence. The two tubes are different in every aspect,and the first thing is you'll have a mu of only 70 with the SL,instead of mu 100 with the 12AX7. Watford Valves - Test Reviews ECC83,12AX7 Test Reports 1998-2002 INTRODUCTION: OBJECT OF THE TEST To establish the best sounding ECC83/12AX7 of both New Old Stock Svetlana 12AX7 - For several years the original Svetlana 12AX7 tube from St. The gain factor of the 12AX7 is 100 and the gain factor for the 5751 is 70. 028: Chinese beautiful sounding e83cc 12ax7 tube as displayed NEAR "TROPHY-QUALITY" CONDITION & PERFORMANCE LONG-LIFE ECC803S VERSION WAS OFFERED BY SIEMENS HALSKE MUNICH IN THE 1960's as their version competing against the Telefunken ECC803S. IN WONDERFUL ALBANY, NY, USA. Real Mullard-Style Tubes! Note: all of the Groove Tubes tubes and sets we carry are "Mediums," or in the 4 to 7 range. The valve produces a gain reduction of between 15 to 30 % when compared 5751's have a lower gain factor than that of the 12AX7. I might try the Sylvania 5751, but in my system the lower output of the 5751 tube does not sound as good as the 12ax7 (the 5751 allows for more background noise, the 12ax7 approach dead silence). The GE Black plate 12AX7 (and 5751) have an enchanting and beautiful sound. As some of you may know, the 5751 is similar to the very common 12AX7 aka 7025 and ECC83 but with a bit less gain. A good GE 5 star 5751 should set you back about $50. This means May 8, 2018 Control the Volume: Fender Blues Deville 410: 12ax7 to 12AT7 Fender Blues Deluxe Reissue Mod (JJ 5751 & Eminence Cannabis Rex)  DIY 5E3 Tweed Deluxe 12AY7 vs 5751 vs 12AX7 - YouTube www. 12at7 / 6201 / Feb 6, 2014 Most modern tube amps use a 12AX7 for pre-amplification, however, you a 5751 in V1 (30% less gain than a 12AX7) to alter the characteristics of . Sound stage is expansive and inclusive. com! (now over 10M hits!) We salute our Nation’s military, past and present. It’s also more heavy duty so it can take a beating. 5751 tube is a close equivalent of 12AX7 with slightly reduced gain. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. So what I have gathered is a lower gain should work in place of a higher gain tube. The nuvistor was developed by RCA and it was first introduced in 1959. We stock tousands of pre-amp valves from NOS to current manufactururers like JJ, Electro Harmonix, Psvane, Tube Amp Doctor (TAD), Fender, Groove Tube and many more 12AX7 Gold Pins (ECC803S) TUNG-SOL. Don, if I recall, the 12AX7 has a gain factor of 100, the 5751, 70 and the 12AY7 around 50. This makes 5751 a better choice for many high linearity low distortion audio circuit. I never A/B'd a current production tube,tho. The JAN-Philips 5751 tube is a NOS military version that has low microphonics and noise. 12AX7, 5751 and 7025 tube reviews by John Templeton. Now it won't damage your Marshall, but it does have a lower gain factor of about 70 vs the 12AX7 at 100. BL One of UK's leading suppliers of premium tested Valves Tubes, speaker, guitar & amp accessories to the musician and audio industries