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    In that case, since you can't find what's wrong...

    In that case, since you can't find what's wrong in the wiring or component functions you could just remove the triode switch, wire the amp stock and then test it. If it works you can wire up a triode...
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    All this regarding pin 6. I don't get why it's...

    All this regarding pin 6. I don't get why it's wired as shown. Since pin 6 isn't internally connected and is typically used as a mounting post for the screen resistor. There's no reason the shared...
  3. Ken Fischer (a guy that's generally considered to...

    Ken Fischer (a guy that's generally considered to have an ear for tone ;)) has said that the best place to put an extra gain stage in a Marshall type amp (which would include a Bassman type amp?) is...
  4. 1) How many Kendrick amps do you see around or...

    1) How many Kendrick amps do you see around or even hear about?

    2) Gerald Weber has a long history selling snake oil.

    3) Anyone who promotes their mod by explaining it to you rather than...
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    IMHE often when you can decrease hum by jumpering...

    IMHE often when you can decrease hum by jumpering two grounds it's because you've actually grounded a ground loop. Not that it could ever be easy in that amp, but locating any possible ground loops...
  6. With such a high output for those pickups I would...

    With such a high output for those pickups I would expect the results posted. The up side is that THE PICKUPS ARE ACTIVE!!! The preamp should have a low impedance output so there should be almost no...
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    Three suspects would be a microphonic preamp...

    Three suspects would be a microphonic preamp tube, failing power supply filter capacitor/s or dirty contacts. Try a different preamp tube in the first and second preamp tube slots. Contacts should be...
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    I can hear clicks (foot switch?) and gain level...

    I can hear clicks (foot switch?) and gain level changes happening. Though it doesn't seem to affect the mice. Just for clarity please:

    What model amp?

    Does it do this with nothing plugged into...
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    The video appears to be in limbo at this time....

    The video appears to be in limbo at this time. *outube instructs me to check back later.
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    Can you parallel the channels? That would be my...

    Can you parallel the channels? That would be my first thing!!! Set up the one with the best OD for some grit and set up the one with the best clean for definition and use any kind of Y splitter to...
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    This^^^^^^^^^^^^^^^^^^^^^^ And if your "meter...

    This^^^^^^^^^^^^^^^^^^^^^^

    And if your "meter is junk" it probably doesn't have auto ranging. Start with a range that accommodates the supply voltage and then range down from there if you can to...
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    And another :thumbsup: My personal amp is (ok,...

    And another :thumbsup:

    My personal amp is (ok, it's actually two amps, but they're the same model) a 2xel84 job that I designed. When I want big, saturated tone at lower volumes I use my...
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    Badump bump.

    Badump bump.
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    Can't say yet regarding the effects loop. You may...

    Can't say yet regarding the effects loop. You may be seeing hum in both locations because you have two problem or still possibly the same problem. As yet to be determined. But either way you should...
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    Do both amps have the same problem?

    Do both amps have the same problem?
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    Is this your schematic? ...

    Is this your schematic?

    https://schematicheaven.net/marshallamps/valvestate80_80w_8080_8100_8412.pdf
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    LOL!!! I can actually imagine Matchless owners...

    LOL!!!

    I can actually imagine Matchless owners talking to each other saying things like: "I replace my tubes every two hundred hours." And the response is "Yeah, well, I replace my tubes every...
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    Matchless used a cross line master on a bunch of...

    Matchless used a cross line master on a bunch of models. And Ceriatone is faithfully including it in their clones :eek:
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    Ah! I see that now. I was "looking" at the wave...

    Ah! I see that now. I was "looking" at the wave forms too fast without thinking and didn't take into account that the waveform isn't crossing at 0V. So yes. That looks horrible.

    Sorry Randall....
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    I thought the same thing. At first... Then I...

    I thought the same thing. At first... Then I considered that the actual AC from the plates is a good bit lower when you take that 0C crossing into account. The actual watts the tubes are making is...
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    Ah! Sorry. I didn't save the master to the file...

    Ah! Sorry. I didn't save the master to the file when I was done. I literally just placed a resistor across the PI coupling cap outputs.
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    ... ...

    ...

    https://music-electronics-forum.com/attachment.php?attachmentid=58442&d=1589057260
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    Trainwreck amps don't have master volume...

    Trainwreck amps don't have master volume controls. These mater volume circuits are sometimes attributed to Trainwreck because their diagrams were provided by Trainwreck. Trainwreck didn't design, use...
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    And here are shots at the power tube plates. Top...

    And here are shots at the power tube plates. Top is with no master circuit and the tubes were drawing 150mA of current. Below is with the master set to 2k and the tubes were drawing 173mA of current....
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    Well it's just simulations, but... Using a TW...

    Well it's just simulations, but...

    Using a TW type circuit with a pair of el84's (because that's the circuit I already have constructed) I measured the signal at the power tube grids. The...
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    Well I'm still working with simpler concepts in...

    Well I'm still working with simpler concepts in my understanding of circuits. "phase cancellation" get's tossed around in these circumstances enough that I've fallen into it.
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    I'm not assuming each PI output to be a perfect...

    I'm not assuming each PI output to be a perfect mirror image of the other. Which they certainly aren't when the PI is clipping. I think that would usually be the case when the master volume is being...
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    Huh? The like phase characteristics of the PI...

    Huh?

    The like phase characteristics of the PI output is somewhat cancelled with a resistance coupling between them. It's the differences between them that is less affected by the circuit. This...
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