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  1. Thread: Ampeg J12-T

    by g1
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    1
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    9

    Have you verified with your meter that 0 on the...

    Have you verified with your meter that 0 on the pot is 0 ohms?
    Aside from that, the pulsing could be coupled through the power supply, C22 would be a suspect.
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    So if it measures the same as other diodes, and a...

    So if it measures the same as other diodes, and a new one also measures same, it should be ok.
    Meantime, what is the unit you are trying to fix and what is the fault? :)
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    81

    If you bought another new bridge and it reads the...

    If you bought another new bridge and it reads the same, then the bridge is probably ok.
    So just a question about your meter, or whether it is some odd type of bridge.
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    108

    I'd also expect the epoxy to work well. However,...

    I'd also expect the epoxy to work well.
    However, because this is a bias probe, it is going to be stressed much more than a normal tube would.
    If the glue won't hold up, try to find one of these...
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    Also some very good but expensive industrial...

    Also some very good but expensive industrial products out there, for example scotch-weld DP8010 or 4693.
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    You can't free it up because it is forming...

    You can't free it up because it is forming "diodes" with the plates and cathodes cross-connected like that.
    Haven't read through all of this, but it's discussed here:...
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    DVL type was specifically called for in that...

    DVL type was specifically called for in that position due to safety concerns (due to failure mode of non DVL caps in line to ground and line to neutral applications).
    Now they use type Y for line...
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    440

    It's a bit hard to tell, but it looks like that...

    It's a bit hard to tell, but it looks like that (-) lug arced over to the chassis. I assume it's one of the caps that needs it's shell insulated from ground.
  9. Thread: Behringer PMX2000

    by g1
    Replies
    6
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    124

    In this case, often the solder joint at the IEC...

    In this case, often the solder joint at the IEC cracks and becomes resistive. The heat buildup causes the trace to burn.
    That's if the burn is right beside or on the solder joint.
    If you can still...
  10. The switch is shown as 2 halves, SA6-A, and...

    The switch is shown as 2 halves, SA6-A, and SA6-B. 3 pins on each half.
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    If it has a can cap that is soldered to the...

    If it has a can cap that is soldered to the chassis, you need a very good joint there for proper grounding. There are lots of tips & tricks available from folks here if that is required.
    What is...
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    I'd guess it's OEM and the 'comm' on the label is...

    I'd guess it's OEM and the 'comm' on the label is for Commando.
  13. Without pictures I have no idea what is or is not...

    Without pictures I have no idea what is or is not on the main board, and I doubt you will be allowed to post pictures yet, but you can try.
    Some high end mixers have all modular construction, so...
  14. Have you opened the unit? Does it have...

    Have you opened the unit?
    Does it have connectors on the individual channels?
    If not, for a novice, it will be no easier for you to disable it than to fix it.

    (P.S. for those following,...
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    You mean the cap he has added, .1uF 63V ? It is...

    You mean the cap he has added, .1uF 63V ?
    It is not electrolytic. Any .1uF of 63V or higher voltage rating will do.
  16. Here is the post I was referring to: ...

    Here is the post I was referring to: https://music-electronics-forum.com/showthread.php?t=49628&p=537786&viewfull=1#post537786
  17. Those schematics are not showing as I don't think...

    Those schematics are not showing as I don't think you have sufficient privileges yet.
    Here is a link to some: ...
  18. Link to other thread: ...

    Link to other thread: https://music-electronics-forum.com/showthread.php?t=49678
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    See here for that resolution: ...

    See here for that resolution: https://music-electronics-forum.com/showthread.php?t=49686&p=538839&viewfull=1#post538839
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    Get the board number and check here: ...

    Get the board number and check here: https://music-electronics-forum.com/showthread.php?t=34637
  21. It was mentioned here recently that it is a good...

    It was mentioned here recently that it is a good idea to remove the PI tube when doing this type of bias measurement to prevent oscillation.
    Also, not sure why you are holding a guitar as biasing...
  22. Thread: Low Volume 5150

    by g1
    Replies
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    332

    Just rehashing what got lost in the shuffle from...

    Just rehashing what got lost in the shuffle from post #6 by Jazz P Bass. :)
  23. Thread: Low Volume 5150

    by g1
    Replies
    25
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    332

    That makes me suspect lack of drive to the power...

    That makes me suspect lack of drive to the power tubes, rather than the OT.
    Maybe try at the plates of the PI tube to see if you can get a more stable reading.
  24. Thread: The Lion Tamer

    by g1
    Replies
    8
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    201

    Should be good demand for this. Nobody likes the...

    Should be good demand for this. Nobody likes the dirty channel in those hot rod amps, and the taper of the clean volume pot is too twitchy.
    Lots of guys looking for a simple solution, and you won't...
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    Those look to all be models that were current...

    Those look to all be models that were current production at the time. I'm guessing they were paying for the bulletin to be performed on all the serial numbers listed (warranty).
  26. Thread: Low Volume 5150

    by g1
    Replies
    25
    Views
    332

    Post #6 there was question about the signal at...

    Post #6 there was question about the signal at the grids. Your response in post #8 was incorrect. Measure AC volts at pin5 with black probe to ground.
    Post result.
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    No problem with your approach. But I think you...

    No problem with your approach.
    But I think you would be quite surprised how cheap you can get a usable scope for. And sometimes nothing else will do (or it takes a heck of a lot longer, cuz I know...
  28. This is what was mentioned in the other thread,...

    This is what was mentioned in the other thread, and why it is better to have only one thread going for a particular topic.
    Glad you got it figured out. :)
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