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  1. 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.
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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.
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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.
  6. 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...
  7. 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...
  8. 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
  9. Replies
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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
  10. 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.
  11. 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
  12. 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...
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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?
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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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    That package is TO99 and there are still sockets...

    That package is TO99 and there are still sockets if you look around for them:

    https://www.mouser.ca/ProductDetail/Mill-Max/917-43-108-41-005000?qs=teNCaa%2FZ3athNwK6rSuF9Q==
    ...
  18. Sorry, I stand corrected on R40. As far as the...

    Sorry, I stand corrected on R40.
    As far as the parallel triode, I did not realize this was the original way the circuit was, and thought it an odd way to do it rather than the standard paralleled...
  19. What do you get with R40 (560K) in circuit? I...

    What do you get with R40 (560K) in circuit? I think shorting it out makes the reverb tank output transducer almost short that V1B grid to ground.
    Also, not sure why they didn't just use standard...
  20. Agree with Enzo, most of those voltages are in...

    Agree with Enzo, most of those voltages are in the ballpark.
    When you say other 1484's have more gain, do you mean ones you have tried with this guitar?
    As far as the main B+ voltage, if the power...
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    Ok, I see what you mean then. So with your...

    Ok, I see what you mean then.
    So with your 18mA, and assuming the tubes are well matched, you would see about .36V at each of the cathode resistors.
    Any time you have a cathode resistor you have...
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    The numbers on the schematic seem to be for some...

    The numbers on the schematic seem to be for some other part number, and not the one they list, which you said is incorrect anyway (through hole part that is not installed).
    So you have to make sure...
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    If you are getting no x-over at 50%, I would go...

    If you are getting no x-over at 50%, I would go with that.
    The .5V at the cathodes is not 'going blindly' as you know the value of the cathode resistor (10 ohms). So it is actually sensing the...
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    Are you looking at the schematic in the datasheet...

    Are you looking at the schematic in the datasheet of the part you are using?
    I'm guessing the pin-out is different from the original part.
    ...
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    When you connect JC202 and the brighter light...

    When you connect JC202 and the brighter light comes on, you have disconnected JC107?
    Then yes, the JC107 circuit may be ok, and JC202 side still has a problem.
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    Do you know if it had the stock speakers, or...

    Do you know if it had the stock speakers, or replacements?
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    Another thing to consider is that crackling can...

    Another thing to consider is that crackling can sometimes be a manifestation of HF oscillation. In such case the presence could be involved as you have found.
    Scope the output of the amp with your...
  28. Do you have a part number?

    Do you have a part number?
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