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    YOU ALREADY FULLY BYPASSED THE CATHODE CIRCUIT!?!...

    YOU ALREADY FULLY BYPASSED THE CATHODE CIRCUIT!?! That means any AC there is at ground potential.

    Does the hum stop when you pull V1?
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    If you fully bypassed the first stage cathode...

    If you fully bypassed the first stage cathode then, since we've already determined the hum source is before the volume control which has only the first gain stage in front of it, you do not have...
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    Well it doesn't always take very much to cause an...

    Well it doesn't always take very much to cause an unpleasant hum. Especially when it's in the first stage of the preamp since guitar amps, even vintage designs, are rather high gain WRT amplifiers...
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    Well since you have a PTP rewire of a Peavey...

    Well since you have a PTP rewire of a Peavey Classic 30 that Hoffman layout means nothing. Did you take this mod all the way into the power supply rail? Certainly you didn't copy the AC30 filament...
  5. Yes, quiet current would be at idle. And it's ok...

    Yes, quiet current would be at idle. And it's ok to have just one tube (or one bank) in for testing. Keeping in mind that with the other tubes out you will have an increase in voltage because of the...
  6. Something is definitely hinky here. You've...

    Something is definitely hinky here. You've measured with and without a current limiter in place. You paralleled some resistances (to 6550 spec as per an old Unicord schematic) in the circuit but...
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    Well there's a small difference in the respective...

    Well there's a small difference in the respective units input impedance. That might cause some sort of anomalous circuit behavior.
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    Understood. Still wouldn't do it that way ;)

    Understood. Still wouldn't do it that way ;)
  9. I'm sure, like me, no one else can believe they...

    I'm sure, like me, no one else can believe they didn't put that together right off.
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    Of course. I agree. But depending on how the amp...

    Of course. I agree. But depending on how the amp is built and wired it may simply be easier to install additional caps. No other reason to do it.
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    Except that a shorted pot, which isn't an...

    Except that a shorted pot, which isn't an uncommon failure, could create a dangerous condition for the player and/or the amp. Easy solution is a .1 cap between the plate and the pot on both circuits.
  12. Interesting.

    Interesting.
  13. I'm not a presence on 10 guy myself, but you make...

    I'm not a presence on 10 guy myself, but you make it work for your style. I can hear the smaller speaker box too so I'm having no trouble listening around it. If you get my meaning. IMO you nailed...
  14. I thought it sounded pretty good other than the...

    I thought it sounded pretty good other than the bee hive. How about another sound clip now that it's polished up.?.
  15. Any details about pop noise? How you mitigated...

    Any details about pop noise? How you mitigated it? etc...
  16. Excellent and fast action. Now I feel like a kill...

    Excellent and fast action. Now I feel like a kill joy because I have to go do a day job thing. But I'll look the pics over when I get home. You may have a bunch of other (and possible better)...
  17. This^^^^^^^^^^^^^^^^^^ I assumed it was...

    This^^^^^^^^^^^^^^^^^^

    I assumed it was cranked. It wouldn't be fair to plug in a dirt box for an amp diagnosis. Possible channel stack? Master circuit? Which would definitely up the ante on...
  18. Could be an oscillation due to lead dress. It's...

    Could be an oscillation due to lead dress. It's not "swirling" so I don't think it's crossover distortion. Can you provide a high res pic of the innards? Maybe we can pic something out visibly. If...
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    I tend toward the design Dave posted. As Enzo...

    I tend toward the design Dave posted. As Enzo pointed out, it allows useful range over the pot without allowing for a dangerous bias condition to be dialed in. I also like the additional filtering...
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    Not as far as I can tell. The videos sound...

    Not as far as I can tell.

    The videos sound pretty good. Sometimes it's hard to tell when you have really good players working. The difference between a good player and a good sounding amp can be...
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    I haven't heard any of these, but I like the read...

    I haven't heard any of these, but I like the read on the home page:

    http://uglyamps.com/
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    Some amps are ugly on the INSIDE. This is...

    Some amps are ugly on the INSIDE. This is supposed to be a Princeton Reverb.?.

    https://music-electronics-forum.com/attachment.php?attachmentid=55481&d=1570715958
  23. OT final, and therefor speaker negative (and now...

    OT final, and therefor speaker negative (and now frames), are grounded to the chassis.
  24. About the best you can do with any small or...

    About the best you can do with any small or small-ish open back combo is to stiffen the power supply with more main filtering and use a speaker that has good low end. Even with this most players...
  25. I interpret that Harold ADDED a cap to the...

    I interpret that Harold ADDED a cap to the existing circuit. We don't know if there is an existing bypass cap at this time.

    Another possibility is that higher levels of LF in the output generate...
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    It really does sound like the same thing I'm...

    It really does sound like the same thing I'm dealing with on my '85 Yamaha SBG. I've owned two others that were eminently adjustable "either way" as you say. Since the trem on this guitar is an early...
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    I have this problem on one of my guitars. I know...

    I have this problem on one of my guitars. I know the model well and didn't expect this issue when I purchased it. Also a set neck guitar. Also a higher end guitar. Since I've seen many of this model...
  28. There are quite a few old school rocker/techs...

    There are quite a few old school rocker/techs that adore and service these old units. Welcome subject matter in the realm we roam. And thank you for posting this in the correct forum.
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