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  1. If pulling the PI stops it, then the power tube...

    If pulling the PI stops it, then the power tube readings are extra.

    3v ripple on the main filter cap is about right.

    We didn;t ask, but is the hum 60Hz or 120Hz? That is a clue to its...
  2. Isolate the problem. Apparently the hum exists...

    Isolate the problem. Apparently the hum exists with all controls down? Fine, then ignore the preamp for now. Pull the phase inverter tube, does the hum stay or go? Stay? Then the power tube...
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    Not necessarily "burnt" out. COuld be the unit...

    Not necessarily "burnt" out. COuld be the unit took a hard drop and the mechanical meters died.
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    Surely would like to see a circuit. I see the...

    Surely would like to see a circuit. I see the split freq type where the highs and lows trem at opposite phase, so it fools the ear. But actual pitch change is not simple.
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    Looking at the 1992 schematic for AC30 TB, I see...

    Looking at the 1992 schematic for AC30 TB, I see the split phase freq trem, but all I see with the trem/vib switch is a change in the EQ. I don't see how it could pitch-shift. if it can, I'd like...
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    285k? SOunds like an open meter to me, or a...

    285k? SOunds like an open meter to me, or a meter with internal circuitry.
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    Agree, I just checked.

    Agree, I just checked.
  8. I must add in defense of the jacks, the ONLY way...

    I must add in defense of the jacks, the ONLY way this damage can occur is through abuse. Like someone stepped on their cord and snapped the jack apart.
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    Does it really shift pitch? Seems to me it...

    Does it really shift pitch? Seems to me it splits the audio into highs and lows and separately trems them. But I don't see any frequency change.
  10. Oh those cockamamie things... I encountered...

    Oh those cockamamie things...

    I encountered their 8-channel mixer. "Stereo" powered mixer. The four left input channels fed one amp, the four on the right fed the other. It also had powered...
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    I have a different take. Peavey always used very...

    I have a different take. Peavey always used very robust transformers. The two 6L6s need not quite 2 amps, and you are talking about dragging a third amp from it. I tend to thinjk eA from a heater...
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    You should get rid of teh old metal 6L6, it...

    You should get rid of teh old metal 6L6, it really isn't a great tube for audio, and it has lower voltage ratings than the glass ones. meanwhile common current production 6L6GC or similar regularly...
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    If I had one I would have posted it, I suggested...

    If I had one I would have posted it, I suggested you draw one from the circuit.
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    Don't we already have a thread on this amp?

    Don't we already have a thread on this amp?
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    Philosophically, I think it is a choice between...

    Philosophically, I think it is a choice between converting an amp to guitar use, or building an amp in the chassis. I like conversions because it requires me to understand the circuits at least to...
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    Exotic? This is a pretty basic amp really. ...

    Exotic? This is a pretty basic amp really. Starting with drawings of the tube bases, you could trace out the schematic fairly easily. I have done that many times for old amps lacking...
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    Ever see a stereo in a dumpster? A dead one...

    Ever see a stereo in a dumpster? A dead one still has good heat sinks in it.
  18. My apology, I meant to say cathode, the end tied...

    My apology, I meant to say cathode, the end tied to the transistor. In other words looking for any resistive path to ground the LED current might take.
  19. Thread: Crap in the gap!

    by Enzo
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    Packing fudge 2, the sequel.

    Packing fudge 2, the sequel.
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    SVT3 secondaries are red/green/red and...

    SVT3 secondaries are red/green/red and orange/yellow/orange. Don't mix your center taps.

    Transformer 94-615-20

    The red wires rectify and filter to 61vDC, so the red wires roughly 45-0-45vAC
    ...
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    When I was a service center for them, the...

    When I was a service center for them, the password was access. That was a while back, it may have changed.
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    Just a hunch: try password "access"

    Just a hunch: try password "access"
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    Or buy a cheap working stereo receiver at a yard...

    Or buy a cheap working stereo receiver at a yard sale and connect the computer to that.
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    You are right, it doesn't. But drivers are...

    You are right, it doesn't. But drivers are rarely time aligned on PA speakers. The voice coil on the tweeter is right near the baffle, while the voice coil of the woofer is maybe 8-10 inches...
  25. With TR1 off the board, there is no path for...

    With TR1 off the board, there is no path for current through LED2, the red one, other than something outside the circuit. That can only mean things like contaminated board, or some unrelated circuit...
  26. I mean no insult, but any chance the LED is...

    I mean no insult, but any chance the LED is simply passing light through from behind? I have been fooled like that before.

    otherwise, I agree with a Q-tip and some isopropyl..COuldn't hurt.
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    The clientele is aging out, but here in Lansing I...

    The clientele is aging out, but here in Lansing I used to do a lot of juke box work. Especially rebuilding old Seeberg amplifier units.

    Organ owners are also aging out. We used to have a full...
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    4.7k = 5k = same thing. You removed the rest of...

    4.7k = 5k = same thing. You removed the rest of the circuit in your drawing. Look at the original, it had a 5k pot at the bottom of the cathode circuit - the presence control. Replace the control...
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