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  1. When you say all the tubes have been swapped or...

    When you say all the tubes have been swapped or replaced, does this mean it was done in an attempt to mitigate the problem? Or is the tube swap/replacement something that was done for maintenance...
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    Just to get back on topic... Sea Chief, are...

    Just to get back on topic...

    Sea Chief, are you going to try a new bug first? If your bugs are old, as in original, it could be worth a try. Lot's of reports about older bugs, uh, buggering the...
  3. I wouldn't say it doesn't matter. But I might say...

    I wouldn't say it doesn't matter. But I might say that if it matters more than one or two percent noise floor when applied to typical tube amp topology that I'd be surprised.

    I've done...
  4. Yep. It's complicated for the layman because...

    Yep. It's complicated for the layman because there a three section, stereo, cliff type switching jack there. But the actual jack function isn't as complicated as the part Fender put there.
  5. In termos defense I'll offer that there's not...

    In termos defense I'll offer that there's not always a lot of control over what happens in a gigging situation. Not to mention something like an open mic night where anyone can play through your gear...
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    I think there are some Magnatones that pitch...

    I think there are some Magnatones that pitch shift. Can't say about the others. I do know that I've heard it in a vintage tube amp. It was pretty awful actually.
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    They'd just buy the two and then cuss and spit...

    They'd just buy the two and then cuss and spit and send one or both back if they didn't work properly ;)

    I've been known to buy two reverb pans when I needed one just because I've had trouble in...
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    Twice ;) ...

    Twice ;)

    https://music-electronics-forum.com/attachment.php?attachmentid=56302&d=1576086603
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    I think it's probably that in your first...

    I think it's probably that in your first observation there was a tube that wasn't conducting. 200F isn't indicative of a tube that conducting, but 538F might be about right for a hot bias on the...
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    It could address both. The "bug" or "roach" is...

    It could address both. The "bug" or "roach" is comprised of a LDR (light dependent resistor) and a lamp. The LDR changes resistance and variably grounds the audio signal (before the mixing stage for...
  11. I was surprised by the title of this thread...

    I was surprised by the title of this thread because I didn't know you were posting a story with a solution. I didn't think YOU would have failed to find the answer to something like this. Glad to see...
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    Boy, am I glad. Both for your experience AND that...

    Boy, am I glad. Both for your experience AND that I wasn't sure if this was a post about some Euro sex film. Phwew! I like to he helpful, but I was wincing as I clicked ;)
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    I assume you mean that the lamination cores...

    I assume you mean that the lamination cores should (ideally) not be on a perpendicular plane? But rather, some degree of offset/diagonal?
    ...
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    Yep. Like I suggested in post #9. Now we know an...

    Yep. Like I suggested in post #9. Now we know an attenuator is being used as well so there's a possible reaction from that unit. Though the guitar was a Les Paul, which usually means humbuckers and...
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    Ah, Yes. That would make sense too. Like any...

    Ah, Yes. That would make sense too. Like any commercial design I would still have a safety resistor there. But if it's not an immediate problem I suppose it doesn't need fixing.
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    That's where I was going with my post. But often...

    That's where I was going with my post. But often a guitarists tech also maintains their amps. That doesn't necessarily mean they KNOW about electronics either. Especially WRT modern amplification....
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    Just to be clear, this guy knows about amplifier...

    Just to be clear, this guy knows about amplifier electronics? Not always the case. Confidence and vaguely related credentials aside,.. We are here if it comes up :thumbsup:
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    Good find. It seems that there are several models...

    Good find. It seems that there are several models though. The site is rather ambiguous about the actual circuitry in each model.

    It reads to me that the one they recommend for the Vibro Champ is...
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    ......

    ...
    https://music-electronics-forum.com/attachment.php?attachmentid=56267&d=1575735527
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    25k pots are redily available from many sources....

    25k pots are redily available from many sources. I'll try to post later with a layout that should make it easy.

    https://www.allparts.com/products/ep-0225-25k-push-pull-audio-pot
    ...
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    This is what I was talking about way back in post...

    This is what I was talking about way back in post #9. We don't even have a description of the problem. Just a second hand account that "there is a feedback problem" and that's all we know. I think...
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    I can get behind that. I don't mind the holiday...

    I can get behind that. I don't mind the holiday screen saver. I use to do it sometimes.

    For those that don't want to clutter their desktop and on the subject of "free". I've never had an OS that...
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    If the amp is unstable (parasitic oscillation)...

    If the amp is unstable (parasitic oscillation) your little speaker should be sufficient to reproduce the problem and you usually don't need to plug in a guitar since these typically do not depend on...
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    Right. And since guys are using these things in...

    Right. And since guys are using these things in their Marshall heads I think there also must be a DC blocking cap for the grid in there as well.
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    Well there's another option... You could use a...

    Well there's another option...

    You could use a 25k push/pull pot as the presence control (they don't come in 5k). Wiring like the later DC blocked Marshall design. Then use the pull switch to...
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    Perkinsman, You seem bent on using the scope...

    Perkinsman,

    You seem bent on using the scope for solving this problem no matter what. You're trying to solve the problem of "diagnosing this amps failure with a scope" rather than trying to...
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    Please see the edit in my post above :thumbsup:

    Please see the edit in my post above :thumbsup:
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    Actually... It doesn't work like that....

    Actually...

    It doesn't work like that. Increasing the cathode bias resistor would reduce current and RAISE voltage. Whatever your memory of how it went down I promise that you did not decrease...
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