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  1. Replies
    15
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    209

    I know you've tried paralleling good caps, but...

    I know you've tried paralleling good caps, but have you scoped the supply while it's happening?
  2. Replies
    13
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    2,571

    some info on ribbon cable replacement for Bassman...

    some info on ribbon cable replacement for Bassman 100T here:
    https://music-electronics-forum.com/...l=1#post550819
  3. Replies
    25
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    4,733

    Not sure if it's the same auto-bias board, but...

    Not sure if it's the same auto-bias board, but some info on ribbon cable replacement for Bassman 100T here:
    https://music-electronics-forum.com/showthread.php?t=48531&p=550819&viewfull=1#post550819
  4. Replies
    18
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    1,283

    Great post Chris, and welcome to the forum. Not...

    Great post Chris, and welcome to the forum.
    Not sure how you tried to attach the image? If you click on the 'insert image' icon, you should be able to select your file, then click on 'upload'. Or...
  5. Replies
    3
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    96

    So set it up again so you have 3VAC going in to...

    So set it up again so you have 3VAC going in to the power amp.
    Measure the AC voltage at the following points and post your results:
    IQ1 base and collector
    IQ6 b & c
    IQ10 b & c
  6. Fastenal?

    Fastenal?
  7. Replies
    28
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    275

    Is the rubber stopping the threaded ring from you...

    Is the rubber stopping the threaded ring from you pushing it down? Agree with The Dude that there is probably a set screw under that ring. I think if you can push the rubber back a bit so the ring...
  8. Replies
    8
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    171

    Yeah, I get it now. Also remembered I have a 400...

    Yeah, I get it now. Also remembered I have a 400 version of that that I parked away because it's so anemic. :D
    Pulled it out and found pretty much the same as you, but with input gain at 8 out of...
  9. Replies
    8
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    171

    Just to be sure, when you had proper level...

    Just to be sure, when you had proper level showing at effects send, you also had 10VAC at the 4 ohm load?
  10. Replies
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    236

    This is true, but also true of regular flu. They...

    This is true, but also true of regular flu. They keep talking about not killing as many as regular flu, but they downplay the mortality rate. I've been keeping track of the numbers. Mortality rate...
  11. Replies
    8
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    154

    I would guess you may find the grid connections...

    I would guess you may find the grid connections (P26 and P28) reversed as well.
  12. I believe one of the advantages is being able to...

    I believe one of the advantages is being able to run the front end of the power amp off the low voltage supplies. I think there are others but of course there are trade offs as well.

    edit: with...
  13. Replies
    88
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    6,174

    You have no load on the output but bulb is lit?...

    You have no load on the output but bulb is lit?
    With power off and HI amp still connected to supply, do resistance checks across the filter caps for the + and - 60V rails.
  14. Replies
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    351

    I'm not completely clear on the jack description,...

    I'm not completely clear on the jack description, but I think those are TRS (tip ring sleeve) jacks. The 'middle' contact you describe is not a ground but a ring. The battery (-) should be going...
  15. For sure try it with guitar as is. One of my...

    For sure try it with guitar as is. One of my best sounding guitar amps is a supposed 'PA' mixer/amp, all stock.
  16. Replies
    10
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    351

    I think that it is also a DPDT switch, not 3PDT,...

    I think that it is also a DPDT switch, not 3PDT, so I don't think there is a switch section at the input jack. Although the other side of the LED switch section might ground R2 or R24 wiper when in...
  17. Replies
    27
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    7,365

    I take it there is no way to just clip those...

    I take it there is no way to just clip those zeners out without major disassembly? Could some kind of angled side-cutter get in there?
  18. Replies
    10
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    351

    That top line going from the LED switch back to...

    That top line going from the LED switch back to the output pot wiper should not be there. That LED switch should be shown as closed because the switch is currently in the effect 'on' position.
    The...
  19. Replies
    5
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    109

    You changed the jack as well as the plug? Was...

    You changed the jack as well as the plug? Was the original insulated or was it connected to chassis?
  20. Replies
    13
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    194

    Looks to me like they use mineral spirits to...

    Looks to me like they use mineral spirits to dilute the 5% as opposed to the 100%.
    (aka naptha as Helmholtz mentioned)

    "Formulation: 5% DeoxIT® (active ingredient), 75% odorless mineral spirits...
  21. Replies
    10
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    351

    The drawing appears to be just wrong, as far as...

    The drawing appears to be just wrong, as far as the switching. I'd look for another in case there are other mistakes.
    How can they put that up on a page that's supposed to be dedicated to these...
  22. Replies
    24
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    454

    Yes, this is the case for both the Mesa and the...

    Yes, this is the case for both the Mesa and the Marshall, correct? My big problem is that Marshall, in their usual modern schematic 'brilliance' has decided to go against all schematic and even...
  23. Replies
    24
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    454

    The question reminds me of that EL34 100/100...

    The question reminds me of that EL34 100/100 Marshall power amp we were discussing the other day. I had the same 'chicken/egg conundrum' reaction. :D
    V2a grid gets signal only from OT secondary ...
  24. Thread: Ashdown ABM Evo II

    by g1
    Replies
    3
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    116

    If physical jarring has an effect on it, then it...

    If physical jarring has an effect on it, then it should be a connection issue. Bad solder, oxidized or loose connector, etc.
  25. Somebody gave me a can of this stuff, it's...

    Somebody gave me a can of this stuff, it's lanolin based and gets very viscous. Maybe similar to what is being described.
    https://www.fluid-film.com/
  26. I can't over-emphasize how good chocolate covered...

    I can't over-emphasize how good chocolate covered espresso beans are either (in case of emergency water outage).
    Be prepared!
  27. It's hard to chug hot coffee. :D Maybe that's...

    It's hard to chug hot coffee. :D Maybe that's why I drink so much, I don't mind it cold at all. Especially in the summer.
    First couple cups in the day have got to be hot though.
  28. Me too. I can fill my mega-mug 3 times from a 12...

    Me too. I can fill my mega-mug 3 times from a 12 cup pot. :)
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