Can a 12AX7 be used as a phase inverter?
If you use a 12AT7 in a phase inverter circuit designed for a 12AX7, you will get less drive from your power section. This of course also depends on the power tubes being used, as some are easier to drive than others. For example, a 6L6GC requires a decent signal to push them to very high volumes.
What is a phase inverter?
A phase inverter is an example where using a 12AX7 tube with matching triodes is beneficial. In a phase inverter, one of the triodes drives one power tube, and the other triode drives the other power tube. The unmatched triodes are not an issue in most circuits.
Can a 12AX7 be used as a split-load inverter?
Yes, but it looks like a 12AX7 is used as a split-load inverter, with a 12AT7 boosting each drive signal (though not in a diff-amp configuration, which seems odd), and a 12BH7 as a cathode follower to drive the relatively heavy load imposed by 3x 6550's max grid resistance. Build problems? Read this first. Re: The Phase inverter!
What happens if a 12AX7 is switched to 12AT7?
"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. ... The lower gain is a factor but the larger factors are: • We have almost 10 times the current available to drive the output tubes before the phase inverter starts to break down.
Which is better 12AX7 or 12AT7?
Both types make great phase inverter tubes, but only if the circuit is optimal for them. A 12AT7 can drive a power section just as well as or better than a 12AX7. Especially when the circuit is designed around its electrical characteristics.
Why does a 12AT7 have a higher impedance than a phase inverter?
Because the phase inverter was not designed to deliver this grid current, the phase inverter sees a much heavier load when the output tubes distort. Because the 12AT7 has a lower internal impedance, it is better able to cope with the lowering impedance of the output tube grids when they distort.
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Tubes explained in AB763 amps | fenderguru
The phase inverter tube is playing an important for the clean headroom of your amp, and it should be replaced as often as the power tubes and for the exact same reason; clean headroom. The recitifier tube we keep longer than the power tubes as long as it is noise free and can provide a high enough bias current for the power tubes.
Learn More →The most important tube in your amp? The Phase …
first gain stage) is the most important tube in . amp. This is true in some cases but not in all cases. V1 (usually the preamp tube closest to the input jack) has the largest impact …
Learn More →12AT7 vs 12AX7 Phase Inverter: Which Is Better? [2022 Guide]
A phase inverter is the last component that the signal passes through before getting into a power amp. And the phase inverter tube properties change how the power amp reacts. The main difference that we can notice is more gain with 12AX7. Or, in other terms, you have less headroom. On the other hand, 12AT7 has more headroom.
Learn More →Bogner Ecstasy power tubes?
Attention Ecstasy owners, I was wondering what power tubes you guys had luck with falling into the very limited bias range of the Ecstasy. SED =C= are recommended and according to the guys at Bogner the Ecstasy was designed with telefunken/siemens EL34''s.
Learn More →12AX7 vs 12AT7: Which Tube is Better?
The phase inverter tube doesn''t need to amplify the signal, but it needs to keep as much current as possible running to the banks. While you can use a 12AX7 as a phase inverter tube, many guitarists find that a 12AT7 gives them a better sound with less distortion and more headroom for soft-to-loud dynamic passages. Jazz Guitar
Learn More →Anyone that likes a 12ax7 as the phase inverter tube?
12AX7 brings more volume and hair at first, but the sound begins to "fall apart" when the amp gets turned up for the power tubes to break up. 12AT7 holds everything together more smoothly and sends more current to the power tubes more efficiently. 5751 works ok in the PI, I''d rather save it for V1/V2.
Learn More →Everything you need to know about 12AX7 Tubes
An example is a phase inverter, which drives the power tubes. In a phase inverter, one of the triodes drives one power tube, and the other triode drives the other power tube. You do not want a 12AX7 with two triodes that are wildly different from each other in this case. Of course, this is not just with 12AX7.
Learn More →Best 12ax7 for phase inverter?
I''ve turned the corner full circle on this. I think if the amp designer calls for a 12AX7, then that''s what should go in there. Putting an AT7 where an AX7 is called for just rolls off the highs, and makes the tone duller with less output.
Learn More →Tube Rolling among the Great''s 12AX7
The phase inverter stage certainly makes a big sound difference in these amplifiers. I''m really starting to pay a lot more attention to the sound of the phase inverter tubes. I used to put any good tube into the phase inverter stage and never considered its sound very much. I was told that they don''t have much effect on the sound.
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A solar power inverter converts or inverts the direct current (DC) energy produced by a solar panel into Alternate Current (AC.) Most homes use AC rather than DC energy. DC energy is not safe to use in homes. If you run Direct Current (DC) …
Learn More →The Phase inverter! The most important tube in …
IMO, the AT7 is the best all-around choice for higher power amps where you must maintain output stage stability with smaller output valve grid leak values (that add more loading to the PI). for smaller amps where the grid leak …
Learn More →Phase Inverter Preference & Why?
A paraphase inverter has excellent gain but is impossible to balance precisely, although there are various ways or getting good approximation of balance. But on the whole it can be quite good for a guitar amp where increasing distortion is called for with increasing gain. There''s lots of good even-order harmonics from a paraphrase inverter.
Learn More →Vox AC15c1 -Tube Layout?
Assuming you are looking at the back of the amp, going from left to right, the first preamp tube (the one with the shield) is v1, and is thefirst gain stage for both the normal and the top boost channels. The second is v2, which is the second gain stage for the top boost channel. The third (the one closest to the power tubes) is the phase inverter.
Learn More →Should i buy a 12AX7 Balanced tube for the phase inverter of …
Stop me if I''m wrong, But I didn''t see anyone post this. Weathered touched on it by saying most PI are not balanced.. Most simple push/pull Amplifiers, and even Single ended amps, only use one triod section of a 12a_7 for the phase inversion.The other section is often used as a seperate gain previous to the PI in some manner.
Learn More →difference between balanced 12ax7 for phase inverter and …
The phase inverter puts half of your signal 180 degrees out of phase with the other half so it can send one half to each side of a push pull output section... A 12AX7 is a dual …
Learn More →Phase Inverter Choices
What are the members opinions of the best choice of a phase inverter for a Push-Pull AB driver for two 6L6GC output tubes? The Cathodyne configuration looks fairly simple but I hear a lot about the AC or DC Long Tail Pair. I''ve tried to make sense of some info I''ve found online but thought it might be good to experienced builders thoughts.
Learn More →Phase-Inverter Tube. Definitive answer, please!
There''s a difference in the way they behave, the phase inverter is the tube that diverts current between pairs of power tubes. A 12at7, though lower in gain than a 12ax7, …
Learn More →AX7-1A / 1BA : 투에스케이
파워퓨즈 [power fuse] ls din 한류형 파워퓨즈 ls ks 한류형 파워퓨즈 vitzro 한류형 파워퓨즈 중원전기 한류형 파워퓨즈 ... inverter, g100 인버터 inverter, is7 인버터 inverter, is7 고효율 인버터 inverter, h100 인버터 inverter, s100 ...
Learn More →Favorite easy 6V6 push-pull circuit?
Don''t need quite the power of 6L6''s, and would like to keep the project more retro, and use a single Jensen P12R speaker as well. From all my schematic-searching travels, this one seems easy, diodes for the power supply, a single 12AX7 and two 6V6GT''s, and it''s an original Fender schematic, a Musicmaster Bass produced from 1970-1982.
Learn More →Fender "the twin" hum
Yes, that''s them. If you don''t have the 0V between center and right points, you may get hum. Center to left is bias, factory setting is .04V, later versions they said up to .08V for better tone with trade-off being reduced power tube life/reliability.
Learn More →Everything you need to know about 12AX7 Tubes
The unmatched triodes are not an issue in most circuits. In some cases, however, using a 12AX7 tube with matching triodes is beneficial. An example is a phase inverter, which drives the …
Learn More →Help me pick an amp design: P-P EL84 with 12ax7 driver
If your power transformer delivers 295VAC output fully loaded on each leg, then the voltage at point A on your power supply will be around 375VDC (roughly 1.3 * 295, minus a bit of loss as heat in the power transformer and voltage drop across the choke--assuming a Hammond choke with ~30ohms DCR).
Learn More →12AT7 vs 12AX7 Phase Inverter: Which Is Better?
Phase inverter use regular preamp tubes. However, in a lot of cases, you can find something else, like 12AT7. The standard 12AX7 and 12AT7 are interchangeable. So which one is better?
Learn More →The most important tube in your amp? The Phase …
12AX7M is also available as a matched phase inverter from the SAG over at GT as the SAG-AX7-MPI. There is also an SAG-AT7-MPI. I have talked about matched phase inverters in other places prior to this piece of writing. The 12AX7M and 12AX7R2 (Sovtek 12AX7LPS) are both long plate designs.
Learn More →difference between balanced 12ax7 for phase inverter and …
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 each side is the same level .... before it goes to the power tubes. Hopefully someone can describe it better for you.
Learn More →Phase-Inverter Tube. Definitive answer, please!
Low noise and the perfect balance between an AX7 and AT7. ... the phase inverter is the tube that diverts current between pairs of power tubes. A 12at7, though lower in gain than a 12ax7, actually ...
Learn More →The Phase Inverter tube. How to choose?
One power tube is fed with a signal that is identical (in-phase) to the original signal, and the other power tube is fed with a mirror-image (phase-inverted) of the original signal. …
Learn More →Tube gurus and experts
The AU7 has substantially lower plate resistance than the AX7, and will tend to draw a lot more plate current given the same operating voltages. The cathode bias arrangement usually used with these tubes will compensate to an extent, but caution is required. ... A 12AT7 can replace a 12AX7 at the phase inverter (actually drives the power tubes ...
Learn More →Audiogon Discussion Forum
It would be advisable to have a schematic and know the size of the transformers and how much current the power supply can handle to know if there could be a problem with the parts. ... I once accidentally put 5814 / au7 in the V1 / ax7 / phase inverter slots of tube monoblocks (Rogue Apollo) and it actually sounded pretty good, but certainly ...
Learn More →Deluxe Reverb lower gain pre-amp tube
This swap can really shift the distortion balance between preamp and power amp to favor power tube distortion when you combine it with the V6 phase inverter tube change as discussed in the next paragraph. Try a 12AX7 in the V6 Phase Inverter for more power tube distortion. The 12AX7''s extra gain will hit the power tubes with a hotter signal.
Learn More →Phase inverter v5,, does it change sound at all?
A 12AT7 has less gain than a 12AX7 and doesnt drive the power tubes as hard.A balnced PI dont mean squat in a guitar amp.The components in your amp,including the PI circuit are +/- 5 to 10% or more tolerance,so even with a balanced PI tube by the time your signal gets out to the power tubes it aint balnced no more.Balanced PI''s are more useful ...
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