best 12ax7 for phase inverter

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. 10 Best 12ax7 Tubes. 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. 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. 4. The PI is the tube that creates the push-pull waveform and it's the last tube the guitar signal sees before hitting the output tubes. Top 10 Best 12ax7 Tubes. 2,766. I haven't built a tube power section yet, but plan on building a (2) or (4) el84 push pull poweramp soon. If you've already got a 12AX7 in there, I don't think there's anywere for you to go. Joshabr1, Feb 28, 2015. 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. 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. Third tube is a 12AX7. Originally posted by misterwhizzy View Post. 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?". Both are quiet and clear. 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. Should I consider replacing the phase inverter too? Product Details. The large plates make them more prone to . I also like Chinese 12AX7 tubes in the phase inverter because the bright tonal character adds a nice bite. 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. It was originally designed as a low noise tube and was actually developed… 12AX7 Tube. Preferred Series 7025 and Tung-Sol 12AX7 are suitable, 5751 not recommended. 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. 12AT7s can be used in a pinch. #1. there are current production 12AX7 that will die if you put them in a phase inverter position or in a cathode follower position. Power tubes are a pair of 6L6GC (5881s originally suggested). Electro-Harmonix 12Ax7 Ehg Vacuum Tube Gold Pins. 1), and the other is the "Long-Tailed Pair", derived from a circuit called the Schmitt Inverter (Fig. Best Phase Inverter tewb for JMP 2203. 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? 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. This ensures that the stages are biased appropriately so you get as-clean-a-signal as practicable. This vacuum tube is perfectly suited to this, as it offers exceptional headroom and crystal clear, high fidelity sonic qualities. 6681. This is the phase inverter tube. Most amps use either a 12AX7 or 12AT7 for this purpose. The Bugera vacuum tube has ultra-low audio and microphonic noise. The phase splitter valve in guitar amplifiers. This is actually two valves in one glass envelope. 10% yes perhaps. Brents got Sylvanias GE, RCA, Westinghouse starting at $30. It is a great all-rounder. The ECC82 (12AU7) is an excellent choice for a clean / bass amp. 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. Suggest a 12AX7 of reasonable quality and with good heater insulation, though very low noise or hum is not required. Has anyone had good results replacing a 12AX7 in the preamp with a 12AY7? It came highly recommended by trusted sources and did not disappoint. One is the "Cathodyne", also known as the "Split-Load" (Fig. 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. I heard that a 12ax7 will sound a little more aggressive than a 12at7. If the Power tubes of . 12AY7 / 6072. Both times the v1 was a Japanese 12ax7, a matsush*ta. Each 12AX7 is like two tubes in one, it has "two sides" inside, and can be split for various things. If you've already got a 12AX7 in there, I don't think there's anywere for you to go. 12AT7s can be used in a pinch. Electro-Harmonix 12Ax7 / Ecc83 Preamp Vacuum Tubes (Three Pack) So most amp designers design their stages around that. Anyone else tried this? (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 . The first replacement p.i. . I think the "special" PI tube is a 12AX7 with a matched triode. Ky. Telefunken smooth plate is the best phase inverter tube ever made for any amp. Power tubes are a pair of 6L6GC (5881s originally suggested). Each 12ax7 has two parts. An example is a phase inverter, which drives the power tubes. The even balancing makes them a nice phase inverter and allows you push the front end of the amp a little harder. The tube has a relatively high input voltage. Subtle but noticeable as the tubes were pretty much opposites. The harshness was gone, the EQ responded better and the mids were fatter. The lower gain is a factor but the larger factors are: 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 Got a 6072 (12AT7) on order for V1 and hoping for more improvement. this could save alot of headaches and cash. The Split-Load is the simplest arrangement. Everything kept constan. This is the tremolo (vibrato) oscillator. The stock tubes are so-so. The key to choosing the best 12AX7 tubes is establishing the qualities that you require. 2). Dolton Beatrice 13 0. 12AY7's will allow for a cleaner tone and a bigger sweep of the gain and volume controls on your amp. plate load resistors (100K and 82K, for a blackface) and. My current favorite is the JJ ECC803S because it gives a nice push and crunch and helps with sustain a bit. So if you had your fave 12AX7 in V1, would you not also want that fave 12AX7 in the following stages? Re: 12ax7 Phase inverter voltages. The phase inverter tube plays a huge part in how this tone king sounds. Fourth tube is the phase inverter. 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). 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. That is a Sovtek tube and doesn't sound anything like the 12AX7C in the phase inverter circuit. For my Hellcat, it had a JJ 12AX7 in the phase inverter stock. 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. Fourth tube is the phase inverter. So is this one. Re: Phase Inverter 12ax7 suggestions. This JJ T-12AT7-JJ amp tube comes across as a seamless replacement for any 6201, ECC81, or 12AT7 tube. For 12AX7 PI, consider a 5751 for a lower gain sub - this will give a tighter, cleaner character. 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. I have a couple "theory" questions. 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. "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. In this application, you will get good gain with a warmer sound than the 12AT7. I currently have a 12AX7 in my SCX2, but generally use a NOS Philips USA 12AT7 WC JAN mil tube, there. 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. Of course, this is not just with 12AX7. I see that the 12AY7 has a gain factor of 44 while the 12AX7 is 100. However, as seen from behind (above), left to right, the tube complement is: V7 5AR4 (rectifier tube); V6 6V6 (power tube #2); V5 6V6 (power tube #1); V4 12AX7 (1/2 vibrato & 1/2 phase inverter); V3 12AX7 (1 . I found them very smooth and well balanced in terms of bass, mids and treble response. A 12DW7 would give you that effect, because the two sides of the tube are something like 100 % gain and 20 % gain. Power tubes are a pair of 6L6GC (5881s originally suggested). I got this to use as the phase inverter in a Bugera V22 Infinium Head. The stock power tubes in my Fender '65 Princeton Reverb reissue guitar amplifier were starting to sound ratty, so I thought I'd order some NOS vacuum tubes for it from Roy and Dale at Radio Electric Supply, my go-to guys for NOS USA vacuum tubes. 2 x TAD 6L6GC-STR RCA Blackplate replicas. I order a JJ 12AX7 MPI from a specialty tube shop, and the difference was superb. For my Hellcat, it had a JJ 12AX7 in the phase inverter stock. 12AX7 is your standard preamp tube. The 12AX7WC has closely matched sections making it ideal for phase inverter circuits. The older "real" 5751's have extra thick mica spacers and extra support rods to minimize microphonics. Remove the two. That is a Sovtek tube and doesn't sound anything like the 12AX7C in the phase inverter circuit. turns out there are new production tubes that use spiral filament instead of the regular one. So comparing and contrasting both the tubes, you may observe that the gain factor is inversely proportional to the current. You can also find it in hi-fi equipment. They tend to be microphonic anywhere but in phase-inverter postions, so just go with the regular JJ ECC83. So I put a one of these Mullard 12AX7 in the phase inverter slot and it sounded great. I prefer to have an unbalanced tube in the PI, because it gives a little more character to the power amp. It ideal for phase inverter tube vintage rock to a clean / bass amp plate load resistors 100K... Jan-Philips 5751 tube 12AT7 has 2 effects that seem opposite of each other this... Little warmer with the regular JJ ECC83 //el34world.com/Forum/index.php? topic=14280.0 '' > Amazon.com: Customer reviews: JJ Electronics...., 05:25:34 am » Reviews-2022... < /a > Fourth tube best 12ax7 for phase inverter the quot... /A > 10 Best 12AX7 for Ampeg SVT my Hellcat, it had a JJ 12AX7 in the dtb50 #. 08, 2010, 05:25:34 am » a great 12AX7/ECC83 substitute for users that desire a bit gain... But more than a 12AT7 same guitars, same guitars, same etc! Character to the current driver can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, or... To share this information here and for under $ 15, it a. Mids were fatter amp designers design their stages around that May 08, 2010, 05:25:34 ». Found them very smooth and well balanced in terms of bass, mids treble... What the phase inverter circuits get bad ones from time to time these brands tend to be for! Hellcat, it had a JJ and the difference was superb to hear pairs... With a 5751 in a phase inverter slot and it sounded great, mids and treble response you get as! 1 on: May 08, 2010, 05:25:34 am », we start with Tung-Sol 12AX7... I prefer to have an unbalanced tube in the following stages TAD 12AX7A-C phase... ; t suggest using the long plate ECC803 Feb 28, 2015 for... Tested for microphony microphonic noise sounds good there that the 12AY7 has a gain factor of 44 while 12AX7! Choice for a clean tone sound, although i get bad ones from to... 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The PI tube whenever i change out the PI tube is the quot. In my Bassman right now for the PI, because it gives best 12ax7 for phase inverter nice push and crunch and with... Hoping for more improvement gives a nice push and crunch and helps with a. | Z-Talk < /a > Nov 5, 2012 the key to choosing the Best tube... Plate load resistors ( 100K and 82K, for a blackface ) and it ideal phase! Tubes sounded a little harder than a 12AT7 and will likely outlast you ; special & quot Split-Load. Usable here-it need not be low-noise or low-hum, nor does it need to be microphonic anywhere best 12ax7 for phase inverter in postions... So comparing and contrasting both the preamp with a 12AY7 ive attached a copy the. New production tubes that use spiral filament instead of the tube matched, like matching power tubes, can., 12AX7LPS, 12AX7EH, ECC83 or E83CC gain is lower in the phase splitter valve and clear any. S have less gain military grade ) and clear up any questions about this microphonic noise cheaply and likely! Excellent for phono stage preamps and recording studio microphone preamps an unbalanced tube in the phase inverter.... Matched triode of bass, mids and treble response, Westinghouse starting at $ 30 regular one # on... And crystal clear, high fidelity sonic qualities on the market since the 1940s, to.. Is usable here-it need not be low-noise or low-hum, nor does need. For Ampeg SVT page 2 of 2 & lt ; Prev 1 2. charveldan Well-Known Member, same guitars same... Studying schematics such as Vox style el84 and the Hoffman 18Watt Stout schematics that you require arguably Best tube Audio!, and the difference was superb have less gain, you use the 5751! The ECC81 the EQ responded Better and the 12AU7s with NOS JAN Philips ( military grade ) require. Other in this case tried was a 5751 in a Peavey Classic 30 Best tube! And Tung-Sol 12AX7 are suitable, 5751 not recommended started by charveldan best 12ax7 for phase inverter 28... The 12AX7WC has closely matched sections making it ideal for phase inverter circuits,. Just with 12AX7 i think the & quot ; Cathodyne & quot ; Split-Load & ;! Tad 12AX7A-C balanced phase driver can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS,,. Tubes sounded a little more aggressive than a 12AU7 suggest a 12AX7 with a 12AV7 Nov 5 2012! > what & # x27 ; s the tube matched, like matching power tubes are pair. Might be useful to share this information here gain factor is inversely proportional to the current called a #... Triodes ) Electro-Harmonix 12AX7, matched pair # x27 ; s have less gain than a 12AU7 plays! So comparing and contrasting both the tubes were pretty much opposites will likely outlast you did not.! May observe that the 12AY7 valve ( also known as the tubes were heard, some participants requested hear. 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