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    You may have a damaged pad(s) on the board from...

    You may have a damaged pad(s) on the board from too much "tube rolling". This happens. Try gently rotating the tubes in a small circular motion and listen for crackles and noise. If there is none...
  2. Glad to hear you're on a first name basis with a...

    Glad to hear you're on a first name basis with a guy there. Mesa was always very helpful whenever I called them and I've been hearing that it's not like that anymore. So this is good news.
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    Well aw $h!t.!? Now I'll have to learn to make...

    Well aw $h!t.!? Now I'll have to learn to make vacuum tubes too? Where the hell is Juan!?!






    ;)
  4. I guess I have to ask... When this started were...

    I guess I have to ask... When this started were you trying to solve a performance problem, scratchy pots, odd distortion artifact, etc., or was this just a puzzle you wanted to solve?

    Why did you...
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    I think this is the RCA amp? True PTP and a real...

    I think this is the RCA amp? True PTP and a real PITA (if not impossible) to try and decipher from photographs. Not much easier on the bench ;) But there's not a lot in there so maybe one focused...
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    This is interesting. Trying to look up a...

    This is interesting. Trying to look up a datasheet for the Shuguang EL34-B offers this site first above all others. This site goes into some detail, repeatedly stipulating that the Shuguang EL34-B is...
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    Well anybody that's been doing anything with...

    Well anybody that's been doing anything with tubes for the last twenty years will attest that many of the Asian tube manufacturers are selling products that are not consistent with their designated...
  8. That's what I get.

    That's what I get.
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    So why does Shuguang think it's a tetrode...

    So why does Shuguang think it's a tetrode :confused:
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    I have a couple of pairs of this tube. I had to...

    I have a couple of pairs of this tube. I had to buy three pairs to get one that wasn't too microphonic to use in a combo amp project :mad: So these ones are a bit too microphonic for combo amp use...
  11. A lot of the above is indicative of trying a...

    A lot of the above is indicative of trying a different input stage tube. This is a good idea. I've seen tubes do some weird things and what you describe would be the least of it.
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    You are only saying the amp was "noisy". And now...

    You are only saying the amp was "noisy". And now it's not "noisy". You didn't specify hum. Did you experience noise reduction other than hum reduction by adding the humdinger circuit?
  13. The static lingering after probe testing the...

    The static lingering after probe testing the grids is still anomalous behavior. It can happen for a couple of reasons. It might be dirty contacts? Certainly clean the contacts.

    When you tough a...
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    You asked ;)

    You asked ;)
  15. It would be fun to have the audio of that ;)

    It would be fun to have the audio of that ;)
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    I think I may need some clarity. 270k would be...

    I think I may need some clarity. 270k would be very high for a "grid resistor" but very typical for a "grid leak resistor". And "grid resistor"s are not typically found on "either side of the grid...
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    I think the swirly distortion must be crossover...

    I think the swirly distortion must be crossover distortion resulting from the bias voltage increase at the cathode resistor with conduction and/or grid loading. Which is also (and probably more...
  18. That resistor is part of a short feedback loop....

    That resistor is part of a short feedback loop. Probably to stabilize the circuit? Such loops appear elsewhere in the amp too I notice. Not sure why they're there since gain is already handled in...
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    Not a lottery. The difference in performance...

    Not a lottery. The difference in performance between new ones should be small as long as you buy from a respected vendor that is going to sell something they know their customers aren't having a...
  20. This is what I was thinking from the start. The...

    This is what I was thinking from the start. The ab763 amps do actually ground the preamp filters on the preamp end of the amp via a relatively long, but independent lead. If the earlier filters are...
  21. Do you suspect 120Hz on the filament supply?

    Do you suspect 120Hz on the filament supply?
  22. I've only ever soldered one bad, new component...

    I've only ever soldered one bad, new component into a circuit. An 80uf/500V electrolytic cap that was (probably) sold stale from Mouser. I have no way to "test" that appropriately before installation...
  23. That makes for a faster visual reference than the...

    That makes for a faster visual reference than the way I've been doing it. Which is to either set my meter so I know mathematically what it's telling me and then count OR set my sig gen to 60Hz for a...
  24. 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...
  26. 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...
  27. 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.
  28. 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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