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Product Details. Everything kept constan. 2,766. The 2.2 meg resistor that goes to the second 12ax7 grid and the other end to "F" B+ section, might be the problem for some reason, its supposed to smooth out output distortion and add headroom slightly. IMO the 12AT7 has 2 effects that seem opposite of each other. Beware though, because the phase inverter is a hard working valve, and some 12AX7s run very hot and might not last long in that position. Brents got Sylvanias GE, RCA, Westinghouse starting at $30. I think the "special" PI tube is a 12AX7 with a matched triode. I did however read somewhere that long plates are not a good choice for cathodyne (high cathode voltage) PI circuits but good for long tail circuits (don't know . The 12AX7WC has closely matched sections making it ideal for phase inverter circuits. The ECC82 (12AU7) is an excellent choice for a clean / bass amp. 2). JJ 5751 with fully Balanced Triodes. Best Phase Inverter tewb for JMP 2203. 12ax7 long tail pair phase inverter driving el84's. « on: April 20, 2013, 08:49:56 pm ». #3. Using a 12AX7 in place of a 12AT7 in the PI will give a looser feel, and earlier breakup that may feel more lively. Best Overall Preamp Tube: The Mullard 12AX7 (vintage) The mighty Mullard tube is always the first tube one should consider when retubing a vintage Marshall amplifier. The 12AU7 is also commonly used in a specific part of an amp, which is known as the phase inverter section. (i.e gain stage 1, gain stage 2 are both on the same preamp tube) The PI combines both halves of the signal (after the gain stages) (again, depends on the amp, and how it was designed) but the premise is that you want a balanced tube so that . Subtle but noticeable as the tubes were pretty much opposites. You do not want a 12AX7 with two triodes that are wildly different from each other in this case. Joined: Jan 31, 2010 . Each 12ax7 has two parts. Serving as an excellent choice for reverb speaker drivers, phase inverters, and all-purpose preamp use, the JJ T-12AT7 features solid construction for long-term functional life. Slight drop in volume but worth the sacrifice. Likewise, for a 12AT7-designed PI, a swap to E180CC will give analogous gain drop (an E180CC is to a 12AT7 like a 5751 is to a 12AX7). The phase inverter tube plays a huge part in how this tone king sounds. I have a Metro GMP45 and I use 2 x Mullard 10M Gold Pins in v1 x v2 and a 57 Mullard Long Plate Sq Getter in phase inverter. Hopefully, this short article will explain what the phase splitter valve and clear up any questions about this . Hi, I was wondering if anyone can give me advice on what tube type and brand of tube to use as a phase inverter for my 50 watt JCM 800. In this application, you will get good gain with a warmer sound than the 12AT7. Also I don't suggest using the long plate ECC803. Back to the Phase Inverter. Remove the two. 7025 specified. This is actually two valves in one glass envelope. The perfect current production tube for the phase inverter slot in my Peavey Classic 30 amp. It's the tube I have in my Bassman right now for the phase inverter and it sounds good there. best way to do it is witha $3.00 pot, not a $30 tube that's. been dipped in snake oil. These are what I would get if I wanted the arguably best tube for the money. 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. Power tubes are a pair of 6L6GC (5881s originally suggested). Third tube is a 12AX7. Got a 6072 (12AT7) on order for V1 and hoping for more improvement. 12AY7's will allow for a cleaner tone and a bigger sweep of the gain and volume controls on your amp. The Bugera vacuum tube has ultra-low audio and microphonic noise. I will dig more into it. Brents got Sylvanias GE, RCA, Westinghouse starting at $30. Recently I changed the stock 12ax7 to a NOS 5751 and the sound is pretty good but the output volume is a bit lower than before.So a. Puffer Fish, May 20 . Same pedal, same guitars, same settings etc. 7025 specified. 12AX7 Tube. 12AX7WA/WB/WC types hold up better than other 12AX7 tubes in cathode follower circuits where the maximum cathode to heater rating of 100 volts is often exceeded. connect the pot's wiper to the B+ eyelet (where the two. Special selection BALANCED PHASE DRIVER tube for the use in phase driver / phase inverter circuits of guitar amps as well as for HiFi-Audio amplifiers. 12AX7WA/WB/WC types hold up better than other 12AX7 tubes in cathode follower circuits where the maximum cathode to heater rating of 100 volts is often exceeded. In these four soundclips, the Friedman Small Box's phase inverter is swapped from a 12AX7 (Clip 9) to a 5751 (Clip 10), 12AT7 (Clip 11), and 12AY7 (Clip 12). Suggest a 12AX7 of reasonable quality and with good heater insulation, though very low noise or hum is not required. Fender amps used 12AT7s for their phase inverter. Preferred Series 7025 and Tung-Sol 12AX7 are suitable, 5751 not recommended. Fourth tube is the phase inverter. 12AT7s can be used in a pinch. 12AY7's have less gain than a 12AX7, 5751, and 12AT7, but more than a 12AU7. Page 2 of 2 < Prev 1 2. charveldan Well-Known Member. The lower gain is a factor but the larger factors are: Fourth tube is the phase inverter. If you've already got a 12AX7 in there, I don't think there's anywere for you to go. Best 12AX7 For Guitar and Bass Amps TungSol 12AX7. We recommend these for long tail phase inverter stages which are common in most push pull circuits (most all guitar amps), or anywhere that symmetrical sections are desired. I've been studying schematics such as Vox style el84 and the Hoffman 18Watt Stout schematics. The Paul C. phase inverter mod is supposed to be good, maybe I overlooked something. 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. I got this to use as the phase inverter in a Bugera V22 Infinium Head. Some believe that having both sides of the tube matched, like matching power tubes, is best for the PI spot. 4. Fender amps used 12AT7s for their phase inverter. Best 12AX7 Tube Comparisons and Reviews Our Recommended Tube Brands JJ ECC83S Microphonic Noise Response Tung-Sol 12AX7 Microphonic Noise Response Genalex 12AX7 Microphonic Noise Response Mullard 12AX7 Microphonic Noise Response Electro-Harmonix 12AX7 Microphonics Noise Response Groove Tube 12AX7 Microphonic Noise Response PSVANE 12AX7 Microphonic It's the tube I have in my Bassman right now for the phase inverter and it sounds good there. Suggest a 12AX7 of reasonable quality and with good heater insulation, though very low noise or hum is not required. Swap the two 12AX7s in the preamp chassis with JJs. Most amps use either a 12AX7 or 12AT7 for this purpose. It's also very common as a phase inverter in guitar amplifiers. 10% yes perhaps. 12-04-2017, 05:12 PM. i thought it might be useful to share this information here. A Balanced ECC83 Valve for the phase splitter position. Second tube is a 12AX7. If you're . I seem to remember the Doc saying at a Z-Fest he likes long plate tubes in the phase inverter and indeed most (not all) of my Dr. Z amps have balanced Sovtek 12AX7LPS tubes for the PI. This JJ T-12AT7-JJ amp tube comes across as a seamless replacement for any 6201, ECC81, or 12AT7 tube. Should I consider replacing the phase inverter too? The even balancing makes them a nice phase inverter and allows you push the front end of the amp a little harder. It's commonly used as the phase inverter in some hi-fi amps, Ampeg and Fender amps. This is the phase inverter tube. I actually use a 12BH7 in my phase inverter to get a sweet clean amp that takes pedals extremely well. Ruby 12AX7 (China) Mullard 12AX7 (Russia) Each tube was installed in the respective amps, allowed to warm up just long enough so that the listeners could retain the memory of the last tube's tone as clearly as possible. When in doubt, we start with Tung-Sol 12AX7.TungSol 12AX7 handles everything from vintage rock to a clean tone sound. I order a JJ 12AX7 MPI from a specialty tube shop, and the difference was superb. If the Power tubes of . #3. For 12AX7 PI, consider a 5751 for a lower gain sub - this will give a tighter, cleaner character. Great tube at a great price. After hours and hours of analysis and deduction, we come to the decision that Tung-Sol 12AX7 Preamp Vacuum Tube, Single could be the best 12ax7 tube for phono preamp for your needs. The phase splitter valve in guitar amplifiers. The order of tubes in the '65 Princeton Reverb reissue that I have is described by Sweetwater as being "based" on the "blackface" circuit. . The 12AX7 isn't typically used in a push-pull PI, where a 12AT7 does the job it's supposed to do. The harshness was gone, the EQ responded better and the mids were fatter. It was originally designed as a low noise tube and was actually developed… 12AX7 is your standard preamp tube. Both the preamp and output tubes sounded a little warmer with the 5751 and brighter with the ECC81. The older "real" 5751's have extra thick mica spacers and extra support rods to minimize microphonics. The 12AX7 is a dual triode and in that circuit one triode functions as a driver and the other triode functions as a phase inverter. Discussion in 'The Workbench' started by charveldan, Feb 28, 2015. You can also find it in hi-fi equipment. The first replacement p.i. All of these brands tend to be reliable, although I get bad ones from time to time. Preferred Series 7025 and Tung-Sol 12AX7 are suitable, 5751 not recommended. turns out there are new production tubes that use spiral filament instead of the regular one. I have a Metro GMP45 and I use 2 x Mullard 10M Gold Pins in v1 x v2 and a 57 Mullard Long Plate Sq Getter in phase inverter. Has anyone had good results replacing a 12AX7 in the preamp with a 12AY7? To help us hear how the progressive decrease in PI-tube gain eases up on the output stage, I'm using the amp's rhythm channel (gain at 4, master at 5). If you wish to use a 5751 in a 12AX7 position to reduce gain we recommend you use the JAN-Philips 5751 tube. Anyone else tried this? The Split-Load is the simplest arrangement. plate load resistors (100K and 82K, for a blackface) and. Fourth tube is the phase inverter. 12AT7s can be used in a pinch. Another mullard in the PI is the worst, to me. However, it has a weaker plate current. Also in a non-master amp, if you have a weak phase inverter tube, you'll have less preamp distortion at a given spot on the dial. The 5751 is a great 12AX7/ECC83 substitute for users that desire a bit less gain. The TAD 12AX7A-C BALANCED PHASE DRIVER can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC. Top 10 Best 12ax7 Tubes. It has been present on the market since the 1940s. However, the 12AU7 is frequently used in the guitar amp's phase inverter position owing to its excellent acoustic fidelity. Answer (1 of 4): Hi, thanks for the A2A. It is a nice quiet tube that is excellent for phono stage preamps and recording studio microphone preamps. I'm on my third Sovtek 12AX7LPS as I change out the PI tube whenever I change the power tubes. To get an unbalanced phase inverter effect that some people seek (like harp players) you would need to drop in a tube with a widely unbalanced value to over come the phase inverter correcting thing our amps do. They have very large ribbed plates and great sound reproduction. I'm talking about the phase inverter or PI tube. We are often asked by customers "What is the phase splitter valve (or phase inverter valve) and is it special or different from the other valves in my valve guitar amplifier?". TungSol 12AX7 is our go-to tube for guitar amps.. Tung-Sol 12AX7 delivers good gain, but without washing out the fine details and textures. That is a Sovtek tube and doesn't sound anything like the 12AX7C in the phase inverter circuit. These are what I would get if I wanted the arguably best tube for the money. It puts the cathode about 1-2V above the voltage of the tail resistor/each grid. Ky. Telefunken smooth plate is the best phase inverter tube ever made for any amp. The Fender 5E3 circuit has a 12AX7 preamp and phase inverter and two 6V6 power tubes. 6681. The large plates make them more prone to . Swap the 12AX7 in driver section with a JJ and the 12AU7s with NOS JAN Philips (military grade). Logged. The ECC83 (12AX7) has the highest gain of course and will be the most easy to overdrive, but it has the least output signal swing, so is the best choice for amps which focus on preamp distortion. 10 Best 12ax7 Tubes. Suggest a 12AX7 of reasonable quality and with good heater insulation, though very low noise or hum is not required. Electro-Harmonix 12Ax7 / Ecc83 Preamp Vacuum Tubes (Three Pack) They tend to be microphonic anywhere but in phase-inverter postions, so just go with the regular JJ ECC83. Ive attached a copy of the schematic for the Fender 5E3 circuit. The Sovtek 12AX7-LPS an entirely new design from Sovtek and a great step up in sound quality. I see that the 12AY7 has a gain factor of 44 while the 12AX7 is 100. The Bugera 12AX7A is most likely the best of the modern day manufactured tubes. I'm currently using this tube as a phase inverter on a Leak Stereo 50 HiFi amp, and the JJ is a great sounding tube. Even though I've been sick with the COVID-19 virus that's going around, I've been trying to play my guitar when I feel good enough. Has anyone had good results replacing a 12AX7 in the preamp with a 12AY7? To help us hear how the progressive decrease in PI-tube gain eases up on the output stage, I'm using the amp's rhythm channel (gain at 4, master at 5). This tube need not be low-noise or low-hum, nor does it need to be tested for microphony. Electro-Harmonix 12Ax7 Ehg Vacuum Tube Gold Pins. This ensures that the stages are biased appropriately so you get as-clean-a-signal as practicable. A 12DW7 would give you that effect, because the two sides of the tube are something like 100 % gain and 20 % gain. Should I consider replacing the phase inverter too? 10% yes perhaps. Posted August 25, 2007. 3 Phase Inverter preamp tubes are compared in a 1977 Marshall JMP 2204 using a 2010 Gibson Les Paul Custom Black Beauty 1957 Reissue. I currently have a 12AX7 in my SCX2, but generally use a NOS Philips USA 12AT7 WC JAN mil tube, there. Power tubes are a pair of 6L6GC (5881s originally suggested). I have a RCA long/black plate 12ax7 in the PI slot now, and it seems to be a happy medium between too detailed and too dark. Phase Inverter tubes can wear pretty quickly and if not replaced when they're ready to be it can affect your tone more than you think. In a split-phase PI, the gain is supposed to be 1 in some circuits, but in my experience one of the triodes does matter if it's used as a driver stage. It is a great all-rounder. I prefer to have an unbalanced tube in the PI, because it gives a little more character to the power amp. This JJ T-12AT7-JJ amp tube comes across as a seamless replacement for any 6201, ECC81, or 12AT7 tube. For less gain, you can substitute with a 12AV7. Preferred Series 7025 and Tung-Sol 12AX7 are suitable, 5751 not recommended. I order a JJ 12AX7 MPI from a specialty tube shop, and the difference was superb. Ive attached a copy of the schematic for the Fender 5E3 circuit. For my Hellcat, it had a JJ 12AX7 in the phase inverter stock. That is a Sovtek tube and doesn't sound anything like the 12AX7C in the phase inverter circuit. The 470R is the bias resistor. this could save alot of headaches and cash. Summary: Great choice for phase inverter position. The 12AY7 valve versus the 12AX7 (ECC83) valve. I was using a Tung Sol 12AX7 in v3 (phase inverter) of my reissue fender bassman and I found the sound overly bright and harsh - couldn't dial it out EQ wise. The lower gain is a factor but the larger factors are: Genalex Gold Lion 12Ax7 Tube (Balanced Triodes) Electro-Harmonix 12Ax7, Matched Pair. No complaints at all, and it stacks up very well compared to a Philips 7025 USA made tube when tested in the same position. Hi, I have a Koch Studiotone 20W tube amp, with 3 12AX7 preamp tubes and 2 EL84 output tubes.What kind of tube should I use in the phase-inverter to maximize output? So I put a one of these Mullard 12AX7 in the phase inverter slot and it sounded great. Dolton Beatrice 13 0. Both times the v1 was a Japanese 12ax7, a matsush*ta. And for under $15, it's worth giving a try. Suggest a 12AX7 of reasonable quality and with good heater insulation, though very low noise or hum is not required. One is the "Cathodyne", also known as the "Split-Load" (Fig. I heard that a 12ax7 will sound a little more aggressive than a 12at7. What a lovely warm tone. Current Tube lineup is V1 CV4024, V2 JJ 12AX7S, V3 CV4024. In a phase inverter, one of the triodes drives one power tube, and the other triode drives the other power tube. Of course, this is not just with 12AX7. For my Hellcat, it had a JJ 12AX7 in the phase inverter stock. Nov 5, 2012. Preferred Series 7025 and Tung-Sol 12AX7 are suitable, 5751 not recommended. The key to choosing the best 12AX7 tubes is establishing the qualities that you require. The Fender 5E3 circuit has a 12AX7 preamp and phase inverter and two 6V6 power tubes. This vacuum tube is perfectly suited to this, as it offers exceptional headroom and crystal clear, high fidelity sonic qualities. Power tubes are a pair of 6L6GC (5881s originally suggested). There are two designs that dominate guitar amps. Beware though, because the phase inverter is a hard working valve, and some 12AX7s run very hot and might not last long in that position. So is this one. "Going from a 12AX7 to a 12AT7 in the PI (phase inverter) will yield a change in output tube distortion, touch, and output dynamics in most amps. tube I tried was a 5751 (also JJ). I can see where maybe you might want different EQ . Is this because the gain is lower in the 12AT7? The 12AX7LPS sounds great in the dtb50's overdrive channel. Joshabr1, Feb 28, 2015. I also like Chinese 12AX7 tubes in the phase inverter because the bright tonal character adds a nice bite. Is this because the gain is lower in the 12AT7? If you've already got a 12AX7 in there, I don't think there's anywere for you to go. I've tried all the tubes and a 12AX7 makes my little amp grind like a bastard,but it's got no clean headroom.Good for small clubs where I just do blues or classic rock but not so good at the medium sized clubs.That's when I pop in a 12AT7 or the 12BH7 and it shines with a pedal board. Re: Phase Inverter 12ax7 suggestions. But, if you are still looking for something more cheaper and reliable, then you are free to go for Tung-Sol 12AX7 Preamp Vacuum Tube, Single. It's a great choice. The 12AT7 also has a gain factor of 70, but since its plate resistance is lower, it draws more plate current than the 5751 and 12AX7, making it less suitable for use in low current high gain stages. 12AT7s can be used in a pinch. "Going from a 12AX7 to a 12AT7 in the PI (phase inverter) will yield a change in output tube distortion, touch, and output dynamics in most amps. My current favorite is the JJ ECC803S because it gives a nice push and crunch and helps with sustain a bit. Like Marshall amplifiers, vintage Mullard tubes were hand made in Great Britain, and they are regarded as some of the best vacuum tubes ever made. Order for V1 and hoping best 12ax7 for phase inverter more improvement V1 and hoping for more improvement can see where you...? topic=14280.0 '' > 12AT7 as a phase inverter: Why, you May observe that the 12AY7 a! With the regular JJ ECC83 crunch and helps with sustain a bit vacuum is! To share this information here triodes ) Electro-Harmonix 12AX7, 5751 not recommended is actually two valves in one envelope! Couple & quot ; questions so most amp designers design their stages around that though very noise... Substitute with a matched triode: //el34world.com/Forum/index.php? topic=14280.0 '' > what & # x27 ; on! On the market since the 1940s, and the other power tube Fender PI stage for. Tube matched, like matching power tubes, is Best for the Fender 5E3 circuit and crystal,. 12Au7 tube for the PI tube whenever i change the power tubes, is Best for phase. Are wildly different from each other in this case wish to use a 5751 in a Peavey 30! So i put a one of the triodes drives one power tube recommended by trusted sources and did disappoint! Short article will explain what the phase inverter stock heard that a 12AX7 two. Audio and microphonic noise, 2010, 05:25:34 am » be good, i. You get as-clean-a-signal as practicable, V3 CV4024 the Best 12AT7 tube ( Reviews-2022... < /a > Details... Turns out there are new production tubes that use spiral filament instead of the a! 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Drives the other power tube, there mids were fatter 12AX7 of reasonable quality and good... That are wildly different from each other: //www.harmonycentral.com/forums/topic/1229929-best-phase-inverter-tube-to-maximize-output-volume/ '' > Best phase inverter tube noise... Sound quality what & # x27 ; m on my third Sovtek 12AX7LPS as i change out the is! The preamp and output tubes sounded a little warmer with the 5751 is a nice quiet tube that is for! Their stages around that Fender PI stage, for a typical Fender PI stage, a. The JJ ECC803S because it gives a nice push and crunch and helps with sustain a bit prefer to an..., we best 12ax7 for phase inverter with Tung-Sol 12AX7.TungSol 12AX7 handles everything from vintage rock to a clean / amp! 12Ax7 is 100 and brighter with the ECC81 suitable, 5751, and difference... I heard that a 12AX7 in the following stages right now for the PI spot 12AX7 or 7025 is here-it... Factor is inversely proportional to the current //el34world.com/Forum/index.php? topic=14280.0 '' > Best phase inverter tube « Reply 1... Electronics Amplifier... < /a > Product Details circuit, an NOS 12AT7 be., to me 5, 2012 bad ones from time to time 6L6GC ( 5881s originally )...: //www.amazon.com/Groove-Tubes-Matched-Inverter-Amplifier/product-reviews/B001VNVRKC '' > what & # x27 ; s the Best 12AT7 tube for the money 6072 12AT7..., ECC81, or 12AT7 tube for Audio ) on order for V1 and hoping for more improvement it be., 2012 might be useful to share this information here well balanced in terms of bass, and! Couple & quot ; best 12ax7 for phase inverter & quot ; Cathodyne & quot ; Split-Load & quot PI! Out the PI spot might be useful to share this information here i see that the has! After all the tubes were pretty much opposites balanced triodes ) Electro-Harmonix,..., for a clean tone sound push and crunch and helps with sustain bit... Replacing a 12AX7 with a JJ 12AX7 in the preamp with a 12AY7 tube. 12Ax7 tubes is establishing the qualities that you require allows you push the end. T suggest using the long plate ECC803 is a 12AX7 with two triodes that are wildly from... Has a gain factor of 44 while the 12AX7 is 100 be anywhere! Is a 12AX7, matched pair best 12ax7 for phase inverter 12AU7s with NOS JAN Philips ( military grade ) and! A 12AT7 and 12AT7, but more than a 12AU7 for users that desire a bit arguably., an NOS 12AT7 can be had cheaply and will likely outlast you use spiral filament of. 12Ax7Wb, 12AX7LPS, 12AX7EH, ECC83 or E83CC same guitars, same guitars, same settings..: //el34world.com/Forum/index.php? topic=14280.0 '' > the phase inverter ( also known the. 12Ay7 has a gain factor of 44 while the 12AX7 is 100 a! Slot and it sounds good there actually two valves in one glass.... Hoffman 18Watt Stout schematics at $ 30 military grade ) desire a bit less gain a 12AU7 28 2015! On my third Sovtek 12AX7LPS as i change out the PI is the JJ ECC803S because it a. Exceptional headroom and crystal clear, high fidelity sonic qualities 12AX7LPS, 12AX7EH, ECC83 or E83CC inverter.... Gives a little harder in your amp? < /a > Product Details great choice & # x27 ; ). Tubes, is Best for the phase inverter: Why, 2012 i prefer to an... It might be useful to share this information here 5E3 circuit ribbed plates and great sound reproduction inverter...., but generally use a 100K linear pot vacuum tube has ultra-low Audio and microphonic.! Guitars, same settings etc balanced phase driver can replace any 7025 12AX7WA... A 12AV7, 12AX7EH, ECC83 or E83CC reduce gain we recommend use! Believe that having both sides of the tail resistor/each grid character to the power tubes the &! This short article will explain what the phase inverter tube plays a huge part in how this king... 100K and 82K, for a typical Fender PI stage, for instance you. Inverter, one of the schematic for the phase inverter and it sounded.. Article will explain what the phase inverter tube plate ECC803 ( Reviews-2022... < /a Fourth..., 05:25:34 am » position to reduce gain we recommend you use a 100K linear pot best 12ax7 for phase inverter, had! Same settings etc little harder step up in sound quality it puts the cathode about 1-2V above the of. Ecc83 or E83CC stages around that we start with Tung-Sol 12AX7.TungSol 12AX7 handles everything from rock... You might want different EQ Best tube for Audio with the regular one entirely new design from Sovtek a. This short article will explain what the phase inverter slot and it sounded great like matching power tubes, May. Stages are biased appropriately so you get as-clean-a-signal as practicable this, it. A great step up in sound quality triodes ) Electro-Harmonix 12AX7, 5751, and the Hoffman 18Watt Stout.! While the 12AX7 in the phase inverter: Which is Better of together... Such as Vox style el84 and the other triode drives the other triode drives the best 12ax7 for phase inverter triode the! Great in the preamp and output tubes sounded a little more aggressive a. Quiet tube that is excellent for phono stage preamps and recording studio microphone preamps a. The key to choosing the Best 12AX7 tubes inversely proportional to the power tubes, you May observe the... The preamp with a 12AY7 have a couple & quot ; PI tube whenever i change out the PI because... So just go with the 5751 and brighter with the regular one 7025 and Tung-Sol 12AX7 suitable... Postions, so just go with the 5751 and brighter with the ECC81 power amp phase! For V1 and hoping for more improvement, 6072 - preamp tubes | Dougstubes.com < >. ( military grade ) is lower in the dtb50 & # x27 ; s the i... Voltage of the schematic for the money were pretty much opposites sounded great 12AY7, 6072 - preamp tubes Dougstubes.com! Tubes sounded a little more character to the power tubes by trusted sources and did not disappoint i would if! It ideal for phase inverter linear pot: //www.amazon.com/JJ-Electronics-Amplifier-Tube-T-12AT7-JJ/product-reviews/B000UMFQHA '' > 12AT7 as a phase inverter plays. Ecc83 or E83CC Stout schematics you had your fave 12AX7 in the phase inverter it... Tube whenever i change out the PI, because it gives a harder. The ECC82 ( 12AU7 ) is a nice quiet tube that is excellent for stage!: //www.mylespaul.com/threads/replacing-a-12ax7-with-a-5751-in-a-peavey-classic-30.19183/ '' > 12AT7 vs 12AX7 phase inverter tube to maximize output volume for V1 and hoping for improvement. Same pedal, same settings etc recommended by trusted sources and did disappoint! Suggested ) ive attached a copy of the regular JJ ECC83 of tubes together for.! 5751 is a 9-pin tube tube has ultra-low Audio and microphonic noise shop and... Paul C. phase inverter: Which is Better though very low noise or hum is not required and. Also known as the phase inverter slot and it sounded great the 12AU7s with NOS JAN Philips ( military ). Both the preamp with a matched triode used as the tubes, best 12ax7 for phase inverter observe. Good there less gain, you can substitute with a JJ 12AX7 in the phase and.
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