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  1. I should add that this is assuming no other short...

    I should add that this is assuming no other short in the primary circuit which is not shown in schematic.
    A power switch shorting to chassis or something like that is also possible.
  2. If that is with all secondary windings...

    If that is with all secondary windings disconnected, then the PT is (most likely) bad.
  3. He has the HT fuse out (#5). So that would leave...

    He has the HT fuse out (#5). So that would leave 6 & 7, yes?
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    Please post schematic version for your particular...

    Please post schematic version for your particular revision of amp.
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    Maybe bad diodes or filter caps in HT supply?

    Maybe bad diodes or filter caps in HT supply?
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    Does that (other) tap remain working when the HT...

    Does that (other) tap remain working when the HT tap goes bad?
  7. Smells funny, let's see how it tastes! ;)

    Smells funny, let's see how it tastes! ;)
  8. I think you said it worked with one cable but not...

    I think you said it worked with one cable but not the other? In that case I would think it was the combined contact wear of the bad cable and the amp receptacle. I'd think that the cable that...
  9. If switch wiring is correct, then new voltage...

    If switch wiring is correct, then new voltage information indicates a bad switch is quite likely.
  10. Yes, a picture of the main filter caps wiring...

    Yes, a picture of the main filter caps wiring would be helpful.
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    Can you post a schematic? Are the mosfets...

    Can you post a schematic?
    Are the mosfets running off the same HT?
  12. Nothing has been accidentally grounded at the...

    Nothing has been accidentally grounded at the center of the totem-pole filter caps? (cap shells insulated if required)
  13. Something must be mis-wired. Y and Z are...

    Something must be mis-wired. Y and Z are supposed to be on either side of the choke, so no way to have that kind of 250V drop across the choke if it is ok.
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    I think the key is knowing the limitations of the...

    I think the key is knowing the limitations of the testing and having a suspected failure mode.
    If you think a filter cap is going 'open' and no longer filtering, the paralleling method works great....
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    Here's one I stumbled across today. Probably...

    Here's one I stumbled across today. Probably nothing of any quality (ETEPON ?), but a DMM, solder iron, holder, sucker, kit all for $25.
    ...
  16. I've not had that problem though I now have...

    I've not had that problem though I now have regular type. The retainer can be very helpful in tight spots where you can't get your fingers or a pair of needlenose with your other hand to catch the...
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    See post #88. :) What I get from that is that...

    See post #88. :)
    What I get from that is that BStringThumper had earlier replaced the 22R's with 220R's.
  18. If I have to strip more than 1 wire, I prefer the...

    If I have to strip more than 1 wire, I prefer the 'compound action' type, like this Klein 11063W. Definitely worth the extra $, and saves a lot of time and effort. The similar type but with auto...
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    See post #88, it had 22R stock, OP replaced with...

    See post #88, it had 22R stock, OP replaced with 220R (because of erroneous schematic :D )

    log1982, top notch work!
  20. The good news is that a 'no sound' condition is...

    The good news is that a 'no sound' condition is likely easier to track down than a 'random crackles'.
    Back in post #3 you were able to get it to change by probing around D21, maybe see if that still...
  21. I think it was discussed earlier in the thread,...

    I think it was discussed earlier in the thread, but it is not just for thermal issues. The shock/contraction effect can be very effective at weeding out hard to find crackles etc.
    It's hard to...
  22. Did you get any freeze spray yet? Active Tech or...

    Did you get any freeze spray yet? Active Tech or Sayal have it for around $20 a can after tax.
    When you consider how much time it saves you, it's a lot cheaper than shotgunning parts.
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    That link is just for the wish login page. Is...

    That link is just for the wish login page.
    Is there no link to see the actual item without having to join something?
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    What value do you find R23 in your amp to be? If...

    What value do you find R23 in your amp to be?
    If log1982 is correct, then there is a typo and someone has changed that resistor in your amp to match the typo. Obviously the amp worked at some point...
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    The schematic part is incomplete. Missing R/P...

    The schematic part is incomplete. Missing R/P amp, I believe. This is the best quality I could come up with, sorry.
  26. Thread: Marshall 100W hum

    by g1
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    So maybe the meter resistance is doing something...

    So maybe the meter resistance is doing something when put on that PI side after the coupling cap? Any chance of bad power tube mismatch?
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    I know Helmholtz mentioned that the tank input...

    I know Helmholtz mentioned that the tank input inductance is not a simple constant 8 ohm, but I'll just pretend it is for a minute.
    The power tube would like to see 6K impedance for optimum...
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    Make sure any board to chassis ground wires in...

    Make sure any board to chassis ground wires in that area are good. A resistance check from stack to chassis should do it.
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