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    Haven't looked in detail but my local small...

    Haven't looked in detail but my local small hardware store carries a rather large variety. Not sure if they're chrome-plated or not though.

    Justin
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    Was going to agree with Mick - a hot & ground are...

    Was going to agree with Mick - a hot & ground are reversed somewhere.

    FYI, when you are touching the "side," that black paint is a part of the circuit. It's conductive shieldibg, which is supposed...
  3. Also, have you tried new/different tubes? A...

    Also, have you tried new/different tubes? A lotbof times a tube that has redplated in the past will continue to do so be ause the elements msy have shifted slightly, making it not behave according to...
  4. That sounds like good old digital transmission...

    That sounds like good old digital transmission noise to me. On top of the three things Chuck listed above, do you keep a phone or any other wireless pr electronic gadgets close to or on your amp...
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    Also being a 69, it could be either AB568 or...

    Also being a 69, it could be either AB568 or AA1069. That AB763 is probably a leftover. And those AB568s had some strange stuff. A closeup of the power tube side of the chassis would narrow it down....
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    Here's what I cooked up for the inputs... I can...

    Here's what I cooked up for the inputs...
    I can do the rest once I get it twiddled to perfection.

    Justin
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    Are you sure it's not an AB568 or AA1069 circuit?...

    Are you sure it's not an AB568 or AA1069 circuit?
    It probably won't help spare the tubes, but there are some wonky things going on in that AB568. Either way, AA763 probably ain't it if it's...
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    As far as I can tell, yes I can. The switch...

    As far as I can tell, yes I can. The switch selects either Both Channels For Me or Either Channel for Me/A Channel Each For Two. Of course, neither is big on power or "dialable distortotronics."...
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    Still plonking away with this thing. I abandoned...

    Still plonking away with this thing. I abandoned the whole dual power supplies as unnecessary, since one seems to work fine. I gave it 4x6V6 to free up heater current also.

    Two channels, each...
  10. You'll have to search flr it here, but Juan Fahey...

    You'll have to search flr it here, but Juan Fahey had some good advice on reinforcing aluminum chassis way back when. I believe the ARRL Handbook from 1972 did also.

    Justin
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    I'm such a low-tech doofus... I have never paid...

    I'm such a low-tech doofus... I have never paid for any of the booteeky cable brands, though I've bought some nice Rapcos with fancier nicer coverings.

    I never consider electrical...
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    I didn't mind this design at all in my...

    I didn't mind this design at all in my Spitfire-w.-Cheez clone. Except it's not really for getting preamp distortion, it's for "taking the edge off" as I think Randall stated above. With this one,...
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    If you're looking to raise the B+ a bit, I'd bias...

    If you're looking to raise the B+ a bit, I'd bias it cooler. Just me, though.

    Justin
  14. I'm not sure whether that would be a deliberate...

    I'm not sure whether that would be a deliberate attempt to get them through quicker, or slower... Though sometimes "Medical Chemicals & Products" might arouse curiosity, if not suspicion...

    I do...
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    Given the 6L6 feedback is removed from my AB165,...

    Given the 6L6 feedback is removed from my AB165, I'd call it basically the same as yours. I think it gives a non-Master Marshall a run for its money. Buckers on 5 = more than AC/DC crunch & it gets...
  16. What Enzo & Chuck said (which is what Enzo said)....

    What Enzo & Chuck said (which is what Enzo said). That said, I'll still take the time to share my opinions...

    In my limited number of builds (5) I've found my favorites have been EL34- or...
  17. ^^^^^ what G1 said. I find no additional...

    ^^^^^ what G1 said.

    I find no additional tonal benefit to biasing at maximum (whether class AB or A) that can't be added via other circuit tweaks or knob twiddling.

    Plus, I have some very nice...
  18. I just might have to try a few out if I ever need...

    I just might have to try a few out if I ever need EL34s. & if the 6L6Gcs have reasonable prices those too.

    I've had mostly bad experiences with Chinese preamp tubes, finding them only usable in...
  19. TADs are Chinese, right? They're like Eurotubes...

    TADs are Chinese, right? They're like Eurotubes with JJ, correct?

    Justin
  20. Given that 2/3 of those cone out of the same...

    Given that 2/3 of those cone out of the same factory, I'd not use ANYthing from that factory. Which is basically ALL of those "Golden Era" reissues & a few "dubious" ones to boot (Mullard 6L6GCs,...
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    So I did some pinout checking & found the 7687 &...

    So I did some pinout checking & found the 7687 & a 6HL8 (I think; maybe 6LH8) I had on hand were the same pinout. Both sounded just as good as any of my 6U8As, & that 7687, zero hum, even at 10. It's...
  22. To be fair: when was the last time MusicMan made...

    To be fair: when was the last time MusicMan made an amp? I haven't heard of one from after the early 80s... Am I missing that?

    Justin
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    From what I can find, 6U8s are the recommended...

    From what I can find, 6U8s are the recommended replacement for a 7199, just needing a rewiring of the socket. It's said they don't need any resistors changed or anything.

    I've got so many...
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    I got bored & decided to make a second parallel...

    I got bored & decided to make a second parallel preamp feeding the PI & output that was good. Ill worry about the rest later, after I cash my "stimulus" check. But right now I've got 2 nice channels,...
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    Probably obvious, but did you try a new tube in...

    Probably obvious, but did you try a new tube in V3, besides just pulling it? Or several, for that matter? Even new tubes can be noisy.

    Justin
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    I'd not use the 5U4 in a Champ, & if they're...

    I'd not use the 5U4 in a Champ, & if they're tested & guaranteed to work, & if the price is right, then sure.

    Justin
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    And NOS singles of US-made 6V6GTAs are still...

    And NOS singles of US-made 6V6GTAs are still relatively cheap. You MAY never hafta buy another one. I'd even consider used. I've got a bunch of old pulls out of a Hammond organ chassis.

    Justin
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    There are 3 tube manufacturers. Shuguang in...

    There are 3 tube manufacturers. Shuguang in China, JJ in Slovakia, & Reflektor/Sovtek in Russia. JJ manufactures under their own name; there is one tube relabeler rhat uses JJ exclusively: EuroTubes....
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