What amps use a 12AX7 in a phase inverter?
Fender Tolex era amps – These generally used a 12AT7 in the phase inverter. Marshall type amps – These generally used a 12AX7 in the phase inverter. There are many other differences in these amps but I will stick to the PI (phase inverter). Some basic tube facts
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.
Do you compare cathode voltage with 12AX7?
I'm curious, did you compare cathode voltage. I'd guess the 12AU7 has 3x the cathode voltage. If using a lower gain tube is what you want to do, more appropriate subs for the 12AX7 are 5751 and 12AY7. Both of these have much higher plate resistance than 12AU7 or 12AT7 and are likely to work better in the circuit.
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.
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!
Does a 12AX7 change a pi?
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. Is this because the gain is lower in the 12AT7? 10% yes perhaps. The lower gain is a factor but the larger factors are:
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Should i buy a 12AX7 Balanced tube for the phase inverter of …
Yes it will change the character of your amp. The output section has a designed threshold of when clipping occurs (B+ voltage for one)...this does NOT change when you …
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Learn More →12ax7 vs 12au7 when to use which one?
The 12AX7 should be only for voltage amps, and the 12AU7 is for phase inverters. Almost all of my amps use a 12AX7 as the inverter, and two use a 12AU7 as a voltage amp …
Learn More →The Phase Inverter tube. How to choose?
The ratio of current to voltage in an AT7 must have a functional impact on the amp. When I was a tube amp user, I liked a ''balanced triode'' AT7 for phase inverter, no V1, and an RCA in V2 for DRRI. Didn''t like the duller 5751, absolutely loved the 12AX7M mullard copy in V2 tonally but didn''t like the breakup.
Learn More →The Phase Inverter tube. How to choose?
at7. reliability is important for the PI. at7s can take 10x the amount of voltage that an ax7 or 5751 can. ax7s can sound cool and kinda drive a little creating a nice warm spongy …
Learn More →Phase Inverter Preference & Why?
A LTPI will have more drive potential than a cathodine at the same supply voltage and input voltage. But supply and input voltage are both "adjustable" by design as alluded to. So a "strong" drive to the output tubes should be achievable via either approach when considering all the "adjustable" variables.
Learn More →AX7-1A / 1BA : 투에스케이
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Learn More →12ax7 vs 12au7 when to use which one?
Broadly speaking, the AX tends to get used more where you need voltage amplification but it doesn''t need to be low impedance. Tone circuits, driver stages, things like that which present very little load do well with a 12AX7. ... Almost all of my amps use a 12AX7 as the inverter, and two use a 12AU7 as a voltage amp ahead of the inverter stage ...
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Learn More →Help me pick an amp design: P-P EL84 with 12ax7 driver
Its kind of awkward for component routing. I tend to like the "triangle" physical layout with the voltage gain / inverter tube forward of and centered between the output tubes. It makes all the stuff lay in there neatly. If I were doing dissimilar triodes, it would probably be a 6AV6 for a gain stage (half a 12AX7) and a 6C4 (half a 12AU7) for ...
Learn More →Tung Sol 12AX7 Datasheet
ANY MOUNTING POSITION THE COMBINES TWO COMPLETELY INDEPENDENT HIGH-MU TRIODES IN THE SMALL 9 PIN BUTTON CONSTRUCT IT IS …
Learn More →12AU7 LTPI help
Center biasing at -6V, yields 2.75mA quiescent current @ 135v. (*initial quiescent plate voltage + cathode voltage = actual quiescent plate voltage of pi: 135+90 = 225v) This swings 155v p-p/12 = 12.92 voltage gain of this pi. For cathode resistor 6v/2.75mA = 2182r/2 (2 tubes) = 1091r nearest value use either 1k or 1.2K
Learn More →Everything you need to know about 12AX7 Tubes
What is a 12AX7 tube? 12AX7 tube is a small signal dual-triode vacuum tube found in just about every tube gear today.. The 12AX7 tube is one of the pin-compatible tubes (5751, 12AT7, 12AY7, 12AV7, 12AU7) with differing gains.Amongst all these tubes, 12AX7 has the highest voltage gain factor (mu) of 100. The high gain factor and the dual-triode configuration allow the tube amp …
Learn More →12AX7 plate voltage exceeds rated max
What''s the consensus on running 12AX7 plates over their max rated voltage of 330VDC. I''ve noticed certain phase inverter tubes are running upwards of 350V on the 12AX7 plates. The Hiwatt DR504OL schematic shows 356V/347V on each side of the PI plates. ... SSS runs a post PI ax7 driver with high voltage. Those seem to survive. Top.
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Learn More →Can AT7 be substitute of AX7 used for phase inverter?
The problem is one tube works as voltage amp and phase inverter, while I want to use a 12AT7 as the voltage amplifier which will influence the sound the most. If only one …
Learn More →12AT7 in V1 and/or V2 for Deluxe Reverb
So, I''ve been playing with my DR and spending Sunday swapping in/out 12Ax7 tubes in V1/V2. I don''t have any NOS, but do have several varieties of modern tubes (EH, Mullard, Tungsol, JJ) I tried putting a 12AT7 into V1, and noticed I like it quite a bit. It quiets the amp a bit, and also tonally m...
Learn More →Should i buy a 12AX7 Balanced tube for the phase inverter of …
FWIW, most phase inverter circuits are not truly balanced as it stands, and for me, a balanced tube does not have any benefit. YMMV. Members; dmk. Posted November 7, 2007. dmk. ... (B+ voltage for one)...this does NOT change when you install a AT tube. All that will happen is the preamp will have to push harder to get the output section to ...
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Learn More →The most important tube in your amp? The Phase Inverter!
The Phase inverter! Many people think that V1 (the first gain stage) is the most important tube in an amp. ... The GT 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. ... it''s being run well below its voltage and dissipation limits. It''s not delivering lots of current ...
Learn More →Can AT7 be substitute of AX7 used for phase inverter?
more current available, an generally less supply voltage needed for linear output. There are plenty of amps that use 12at7 as an inverter, just as there are plenty that use an 12au7 or 6cg7 as the inverter with even much less plate resistance. Dyna 70 VTA uses 12at7 for an inverter, that Eli Duttman PP 6V6 uses it as well.
Learn More →The most important tube in your amp? The Phase …
distortion. Our phase inverter is breaking down too. The ratio of this front end distortion to phase inverter drive d breakdown is determined by amplifier design topology. You …
Learn More →Has anyone used a 6AV6 as a phase inverter?
In it the cathode voltage of the phase inverter is stated as 75 V (while the 6.3 V heater supply is grounded). This 75 V is measured without any signal. With signal this voltage will go up and down, and with full signal this voltage will come very close, or will even pass the maximum of 90 V.
Learn More →phase inverter question
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Learn More →12AU7 vs 12AX7: The Difference You Need To Know
Phase Inverter and Power Amplification. Moving on to the phase inverter and power tubes, your 12AU7 and 12AX7 choices continue to play essential roles. The 12AX7 can push the power tubes harder due to its higher plate voltage, creating more overall amplification and distortion—suiting players who crave dynamic and powerful performance.
Learn More →The ''12AX7′ Tube
The 12AX7 is a miniature high-mu twin triode. This tube is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators and numerous industrial control …
Learn More →Tubes explained in AB763 amps | fenderguru
Rectifier tube. These tubes affect the clean headroom and attack of the amp. 5U4GB results in a lower plate voltage in the amp, meaning less clean headroom and more sag. GZ34 offers a higher plate voltage. Hence more power available in all tubes, power and preamp. Tube wear. Tubes gradually get worn out when an amp is played.
Learn More →Tung Sol 12AX7 Reissue in a cathode follower circuit
The problem is those tubes don''t have enough resistance between the cathode and the heater filaments. Folks who insist on using Ruskie tubes for the cathode follower have fixed the problem by using a DC voltage offset on the heaters. This lowers the voltage difference between the cathode and the heaters, so current doesn''t flow between them.
Learn More →12AU7 as cathodyne phase inverter
What would be the advantages of using half of a 12AU7 as the triode for a cathodyne phase inverter as opposed to a 12AX7 (disregarding the fact the other triode would probably be the preceding gain stage with a lot less gain)? ... The theory of adding the grid stopper on the 12AX7 was to try to limit grid current if the grid voltage swing tries ...
Learn More →12AX7 plate voltage exceeds rated max
What''s the consensus on running 12AX7 plates over their max rated voltage of 330VDC. I''ve noticed certain phase inverter tubes are running upwards of 350V on the 12AX7 …
Learn More →Tube gurus and experts
A 12AT7 can replace a 12AX7 at the phase inverter (actually drives the power tubes harder), but shouldn''t be used as a replacement gain stage. A 12AU7 also should only be used where designed. 5751''s were designed to be lower gain replacements for 12AX7''s and have same internal resistance. 12AY7''s are close enough to 12AX7 and 5751.
Learn More →Finished my first PP amp, 6SJ7-6SN7-6v6
While it looks like you did something with heater to cathode voltage, I might derive it locally in case the preamp is powered down or the connector falls off. Congratulations on avoiding the mistake of a large first cap after the tube rectifier. Very nice. Doug . Last edited: 2010-07-25 6:49 pm. athos56. Member.
Learn More →Snubber Capacitors Application Guide
, times the number of voltage transi-tions per cycle. For example, if your circuit is a half-bridge converter, there are two voltage transi-tions per cycle and the power in the resistor is: P. r = C. s. V. o2. f. s . C. s = snubber capacitance . V. o = off voltage f. s = switching frequency . Choose a snubber capacitance value which meets two ...
Learn More →What is the probable configuration of a 6BX7 amp I used to …
I converted an Eico ST70 to ppp 6BX7 - used one section of a 6DJ8 direct coupled to the 6SN7 inverter (retaining the original AX7 plate voltage), choke input for the output stage to get roughly 300vdc- no loop feedback - very nice and fun amp. ST70 originally ran 7591 - the output transformers are every bit as good as those on HF87 and on a better chassis.
Learn More →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. ... The GT 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. ... that subsequent preamp tubes are designed to carry a small amount more voltage from the previous ...
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