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  1. I take the A1M to mean it's 1Meg log. Looks like...

    I take the A1M to mean it's 1Meg log. Looks like that should work.
    The one at Full Compass listed as POTP-00026 looks like a sub that you would have to run wires from the lugs to the board.
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    I'd say any good mixer should be able to push a...

    I'd say any good mixer should be able to push a power amp to full output. Online calculator says 28dbu is in the 20Vrms ballpark.
  3. Thread: Customer implodes!

    by g1
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    Maybe not just socially. This business is not...

    Maybe not just socially. This business is not immune to people who are completely nuts or have various mental health issues. The bigger the client base, the more likely you are to come across them....
  4. Wouldn't the same type of insulator from a hair...

    Wouldn't the same type of insulator from a hair dryer work? Lots of them around thrift stores here for very cheap.
    Or would they not be sufficient temp.?
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    While you're in there, how's that ni-cad holding...

    While you're in there, how's that ni-cad holding up?
    Used to be we would disconnect the charging circuit and put a lithium coin cell in when they needed replacing.
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    Both those 1.5Meg resistors at the R&R switch are...

    Both those 1.5Meg resistors at the R&R switch are good?
    Attaching schems for interconnect (R&R switch) and other 3 boards that R&R switch connects to.
    ...
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    The fuses don't narrow it down a lot. Just...

    The fuses don't narrow it down a lot. Just eliminate issues with the +/-80V rails at the power amp modules.
    All the other places the +/-80 and +/-90V go are not fused.
  8. I would look at older clothes dryer elements (and...

    I would look at older clothes dryer elements (and repair kits for same).
  9. So you have a pair of them, and if you swap them...

    So you have a pair of them, and if you swap them around, the same one cuts out?
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    You can't just make stuff up (whoever designed...

    You can't just make stuff up (whoever designed it).
    Like 'Q1 put in backwards because it sounds gnarlier', or bypassing the coupling cap with SW1. :confused:
  11. So they probably all do it then. ;)

    So they probably all do it then. ;)
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    I think he wrapped it up in post #4. :) Good...

    I think he wrapped it up in post #4. :)
    Good info anyway though.
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    Nice work nickb, and very reasonably priced. :)

    Nice work nickb, and very reasonably priced. :)
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    I was just going to say that Grayhill seems to be...

    I was just going to say that Grayhill seems to be where the stock is at. :D
    Here's the datasheet for the Grayhill 34A series if anyone should need (34B series similar but with plastic bushing):
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    Ok, but the board looks like it says S4 there? ...

    Ok, but the board looks like it says S4 there?

    Maybe one of these:
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    Another thing is that aside from looking like the...

    Another thing is that aside from looking like the original size, you want the leads to be long enough for replacement parts in older stuff. You don't want to be needing to add wires to make the...
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    What is the switch function and where is it on...

    What is the switch function and where is it on the schematic?
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    I think you could select vol.1 or 2 with...

    I think you could select vol.1 or 2 with footswitch? So like a footswitchable boost?
    Also, I think they often did a funny thing where R21+R24 meant the 2 in series, so 10mV total from Q4 emitter to...
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    When you were getting that 10V reading for the...

    When you were getting that 10V reading for the one power tube, did you try swapping them around just to be sure? It may have been the funny oscillation problem (from the meter probes) so it's worth...
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    Yes, both plate and screen current run through...

    Yes, both plate and screen current run through the cathode.
    If using socket type bias probe, you need to verify it is measuring cathode current, some do measure plate current only.
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    Please provide links for "dadroadie thread Blues...

    Please provide links for "dadroadie thread Blues junior power tube bias" and "Leo_Gnardo bias mod on R52".
  22. Oh, and this: :D...

    Oh, and this: :D
    https://www.fullcompass.com/prod/513301-marshall-m-revb-00007-dfx-pcb-for-valvestate-avt100
    edit: oops, out of stock
  23. You can find all the schematics in this thread: ...

    You can find all the schematics in this thread: https://music-electronics-forum.com/showthread.php?t=27915
  24. I have a feeling they'd say 'oh that's nothing,...

    I have a feeling they'd say 'oh that's nothing, you should see Chernobyl'. :tape:
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    They used that package bridge a fair bit. ...

    They used that package bridge a fair bit. KBPC102 is 3A, 200V. You can get KBPC108 from mouser I think, 800V but should be same size. Or you can use the kind with lugs and run wires. Best to keep...
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    It will work but you will lose the protection if...

    It will work but you will lose the protection if there is a malfunction.
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    But he measured the track in the old (original)...

    But he measured the track in the old (original) one as 100 ohms. :)
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    Here's a pic that came up from that part number....

    Here's a pic that came up from that part number.
    54280
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