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[Justin Thomas]

Wow, this is new...
Usually I can find my way to the "View Full Site" button, but not today!

REEEEEEEEEEEEEEEEEEEEEEEEE!!!...

[Justin Thomas]

Off Topic a Bit, but is there a reason for this?

Justin...

[Justin Thomas]

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 Thomas]

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

FYI, when you are touching the "side," that black paint is...

[Justin Thomas]

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...

[Justin Thomas]

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...

[Justin Thomas]

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...

[Justin Thomas]

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

Justin...

[Justin Thomas]

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. ...

[Justin Thomas]

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...

[Justin Thomas]

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...

[Justin Thomas]

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...

[Justin Thomas]

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. ...

[Justin Thomas]

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"...

[Justin Thomas]

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

Justin

[Justin Thomas]

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

[Justin Thomas]

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...

[Justin Thomas]

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...

[Justin Thomas]

^^^^^ 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...

[Justin Thomas]

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...

[Justin Thomas]

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

Justin