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  1. Oh, I see. Seems I was on the wrong track since a...

    Oh, I see. Seems I was on the wrong track since a while. So transformerless current drive. Good approach nevertheless! Mind that the coupling cap(s) become part of a series resonant circuit together...
  2. This circuit is dubious and certainly contains...

    This circuit is dubious and certainly contains errors, at least it is incomplete.



    Maybe I misunderstand (not being a native english speaker), but I thought you are replacing a transformerless...
  3. Oh, thanks. The transformerless PP circuit makes...

    Oh, thanks. The transformerless PP circuit makes a lot more sense with the high voltage, high impedance capacitive piezo transducer load. So I assume the reverb transformer has been chosen to match...
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    To achieve something like this ? 55924 I...

    To achieve something like this ?

    55924

    I tried all this stuff over the decades and always came back to the original hardware (Fender Vintage, Callaham, Gotoh) because I liked the sound and feel...
  5. It's much safer to connect to an isolating mains...

    It's much safer to connect to an isolating mains transformer. I use my isolating variac which also features a current meter and an automatic circuit breaker. But alternatively you can power the PT...
  6. Is the reverb transformer still the original one?...

    Is the reverb transformer still the original one? If it was used in a PP arrangement driving a high impedance piezo transducer, changes are that high that it won't work (properly) with an AB763...
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    One more point: With a 30 tilt the pivot screws...

    One more point: With a 30 tilt the pivot screws need to be slackened quite a bit because of the flat bottom of the traditional screw heads. This bears the risk of an undefined/moving height position...
  8. No problem with that. The V1B grid sits on 0 DCV...

    No problem with that. The V1B grid sits on 0 DCV anyway. It will load down the output transducer via R41 (68k), though, causing reverb treble loss with an inductive transducer.



    Hardly. While...
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    I agree that there are other influencing factors...

    I agree that there are other influencing factors like saddle height and position (distance from the pivoting screws) but generally more tilt increases the detuning issue. Just use your tuner to...
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    Consider using freeze spray to identify...

    Consider using freeze spray to identify cracked/bad solder joints.
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    This should not be. Does your neck have a working...

    This should not be. Does your neck have a working truss rod (or 2)?
    Do you know how to measure neck relief? Do you have a straight edge that covers the whole fretboard?
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    Maybe a little. But the main reason is the lever...

    Maybe a little. But the main reason is the lever principle. The more parallel the strings and the baseplate are, the more force/tension is necessary to tilt the bridge.

    A practical example:...
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    There is no doubt that a Floyd Rose is superior...

    There is no doubt that a Floyd Rose is superior regarding range and tuning stability as well as from a purely mechanical POV.This said, I much prefer the SOUND AND FEEL of a vintage type vibrato (I...
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    For best performance (frequency response, power...

    For best performance (frequency response, power handling) the crossover frequency and filter type (steepness) need to be tuned to the frequency responses/sensitivities (SPL) and the power capacities...
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    PI?

    PI?
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    Not related to the MV subject, but while the...

    Not related to the MV subject, but while the audible difference between the two NFB networks should be minor, the additional lead compensation (C58//R76) in the 50 may be essential for ensuring HF...
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    How many lumens do you recommend?

    How many lumens do you recommend?
  18. The link in the other forum doesn't open. Are...

    The link in the other forum doesn't open.
    Are you sure that it's an interstage transformer and not an OT? What's its size, can we see pictures? Where is it connected?
    A 70V line only makes sense...
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    Wondering where in the amp's signal chain the...

    Wondering where in the amp's signal chain the cutting out actually happened. Surely the additional LF (quasi-DC) would shift the bias of the preamp tubes and cause some amplitude modulation like a...
  20. Possibly HF oscillation. The associated HF...

    Possibly HF oscillation. The associated HF currents can be very high and thus load the power supply and produce audible ripple hum. Do you still have the "bad" tube? Maybe it's not really bad but...
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    I think that (apart from bootstrapping part of...

    I think that (apart from bootstrapping part of the first triode's plate load) the PI essentially works as a Concertina/split-load type (the Jeffery article calles it "cathode follower PI"), and this:...
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    Sure, the method is obvious to anybody who...

    Sure, the method is obvious to anybody who understands transformer (and meters).
  23. - The virtual Twin sounds much cleaner. The...

    - The virtual Twin sounds much cleaner. The distortion heard with the real amp might be due to the recording. But any real Twin starts to distort above a vol setting around 4. (The numbers on the pot...
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    Why not show the MSDS to your doctor? I wouldn't...

    Why not show the MSDS to your doctor?
    I wouldn't expect to find a real health expert around here.
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    Probably not: Neck through body construction.

    Probably not: Neck through body construction.
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    To be clear, I can't comment on Chinese brands. I...

    To be clear, I can't comment on Chinese brands. I doubt they are comparable to japanese quality, might look similar, though.
  27. Thanks. Pittman's book I have and now I...

    Thanks.

    Pittman's book I have and now I remember having seen the Trainwreck pages containing MV proposals (probably 20 years ago - must have become a kind of bible to the internet community in the...
  28. What is a type 4 master vol and who invented this...

    What is a type 4 master vol and who invented this arbitrary numbering? Is it just the standard pre PI master (like with a Marshall 2203)?
    Would a PPIMV mask the spill-over distortion?



    I guess...
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