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  1. Replies
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    Good point, could be 2 separate issues, solder...

    Good point, could be 2 separate issues, solder joints on power tube sockets causing bias problems/redplate, and PI plate resistors making crackling.
  2. see edit, post #20

    see edit, post #20
  3. Am I seeing things or is pin1 connected to a...

    Am I seeing things or is pin1 connected to a heater wire? (pin8 is without connection)

    https://music-electronics-forum.com/attachment.php?attachmentid=55989&d=1574039943
    55989
  4. But then we get into the argument about whether...

    But then we get into the argument about whether the intermodulation distortion with regard to the ripple is better with 50hz or 60hz.
    I seem to recall that coming up in some discussion recently.
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    Most likely you need to re-solder the power tube...

    Most likely you need to re-solder the power tube sockets.
  6. I'm not sure what you mean about using jumpers to...

    I'm not sure what you mean about using jumpers to connect the resistive side of where the bug was, that would kill the signal.
  7. But this one (in my plane) goes to 400Hz... ...

    But this one (in my plane) goes to 400Hz...

    55970
  8. Replies
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    Before anyone tries to claim the reward with this...

    Before anyone tries to claim the reward with this one, it doesn't count (not 'hotdog'). :D

    https://music-electronics-forum.com/attachment.php?attachmentid=55969&d=1573954843
    55969
  9. Replies
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    When you said you replaced the tubes, did that...

    When you said you replaced the tubes, did that include the 6L6 power tubes?
  10. I think he was referring to the 'sound' of the...

    I think he was referring to the 'sound' of the hum and the harmonic content, rather than the circuit type.

    As far as the language thing, I'm an english speaker and even my reading comprehension is...
  11. Replies
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    This is very strange. Resistors almost never...

    This is very strange. Resistors almost never short. Is it's body marked as a 100K resistor?
  12. Replies
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    Backplate and removable cover are 2 different...

    Backplate and removable cover are 2 different things. The 'backplate' is essentially part of the polepiece, like Enzo said.
    I would normally just call the whole assembly stuck onto the basket the...
  13. Replies
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    Yes, I was talking about the magnet backplate...

    Yes, I was talking about the magnet backplate (black). Fender only uses that with black baskets.
  14. Replies
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    I would have thought the same, but they would...

    I would have thought the same, but they would have had to re-paint the basket blue, and I can't see why they would.
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    That is a most bizarre (and ugly) colour...

    That is a most bizarre (and ugly) colour combination. Never seen that before.
    It sure looks like the Weber 10F150 basket. I wonder if he ran out of magnets on a run and got some from Fender....
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    It may help. Definitely worth a try.

    It may help. Definitely worth a try.
  17. Replies
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    You used AC fan? 120V? Where did you connect...

    You used AC fan? 120V? Where did you connect for power? Where did you route the wires?
    Pictures would help.
  18. If Q11 is ok, then R87 may be the only problem. ...

    If Q11 is ok, then R87 may be the only problem. I suppose the crackling could have been R87 on it's way out.
    But it could also be that Q11 is going bad when powered, yet tests ok unpowered.
    If...
  19. The power transistors connected to the positive...

    The power transistors connected to the positive rail are responsible for the top half of the signal.
    As the upper transistors turn fully on, the output is basically shorted to the positive rail, and...
  20. Replies
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    The latter part of this vid is what I would...

    The latter part of this vid is what I would expect with preamp volume full up.


    https://www.youtube.com/watch?v=1HnrVmLxbQY
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    Not sure why it's not showing, google search for...

    Not sure why it's not showing, google search for this: Mouser #:
    575-91743108
  22. I'd try a 47K in parallel with R106 and see what...

    I'd try a 47K in parallel with R106 and see what kind of range that gives you.
  23. Replies
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    Then this layout should be correct: ...

    Then this layout should be correct:

    https://music-electronics-forum.com/attachment.php?attachmentid=55939&d=1573677708
    55939
  24. Thread: LM307H question

    by g1
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    You had another post about this, I put up some...

    You had another post about this, I put up some links in there.

    https://music-electronics-forum.com/showthread.php?t=50007
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    I think with master volume set low and which ever...

    I think with master volume set low and which ever channel volume full up, should give a reasonable amount of crunch. Tone settings will also affect this, so they should at least be up half way.
    ...
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    On CPU's that have fans attached, I'm pretty sure...

    On CPU's that have fans attached, I'm pretty sure they blow air towards the CPU.
    That being said, the fan is not going to cure what ever fault is making the amp overheat. The underlying cause will...
  27. Replies
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    This is happening with a dummy load or with a...

    This is happening with a dummy load or with a speaker?
  28. Replies
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    I'd suspect something funny with the JJ KT88 pin...

    I'd suspect something funny with the JJ KT88 pin out compared to 6550, but I see eurotubes including them in a tube kit for this amp.
    I do see the JJ datasheet a little funny in that they call out...
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