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  1. It's your "secret weapon" combination, at long...

    It's your "secret weapon" combination, at long last you found it! Lucky, some of us never do...
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    As Enzo mentioned, some hifi manufacturers did it...

    As Enzo mentioned, some hifi manufacturers did it this way in order to provide a feedback signal of the preferred polarity off the "0" winding. I've seen it done in some Scott amps. But no such thing...
  3. Great test setup & terrific reporting nevets!...

    Great test setup & terrific reporting nevets! Also a great way to use what would otherwise be a doorstop, the Yamaha SS power amp with one channel kaput.

    On those fuse looking lamps, they're...
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    See comment 19.

    See comment 19.
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    So, skinny electric guitarists get more sustain,...

    So, skinny electric guitarists get more sustain, the guitar body vibrations would be damped by pressing against a mound of flesh - how about that ! ! !



    Those of us who aren't "science deniers"...
  6. Amp Parts Direct carry some Cliff jacks, worth a...

    Amp Parts Direct carry some Cliff jacks, worth a look. You might get lucky. I hope so!

    https://shop.amppartsdirect.com/Cliff_c67.htm

    If you do tangle with Yamaha let us know how it works out....
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    Just a volume control between channel mix point...

    Just a volume control between channel mix point (the typical pair of 220K) and the input to the phase inverter. What's unusual is that Fender lands what would be the ground end of the pot onto the...
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    On my own Silver-face Twin master volume, I got...

    On my own Silver-face Twin master volume, I got rid of the mostly useless (and hum attracting) pull-for-boost wiring & installed a plain old 1M A taper pot. I don't find much attraction to dialing it...
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    I'm with The Dude on this one, if it sounds good,...

    I'm with The Dude on this one, if it sounds good, it is good. FWIW when a Fender owner says he's got "too much reverb" - can't turn the knob up past 2 without getting too far back in the tunnel - one...
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    Back when they were new, no less than BB King was...

    Back when they were new, no less than BB King was a fan. At least that's what the gee-tar magazines would have you think. He appeared in print ads for Lab Series, so you expect he was at least...
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    This one just in from the Scotty Kilmer channel,...

    This one just in from the Scotty Kilmer channel, a kool bright white LED lamp, runs on 120 VAC, $40 on Amaxon w/ free shipping. Dang, I could see one of these UFO lookin' things suspended over my...
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    Stan aka km6xz has been on the missing list...

    Stan aka km6xz has been on the missing list around here over the past 2 years or so. And we miss him. I hope one of our other members can respond to help you.
  13. I'm bothered by this too. Some of the mods - no...

    I'm bothered by this too. Some of the mods - no big deal. But the way Fender joins channels to send both to reverb & vibrato - brrrr.... they just glom the plates together. A pair of mixing resistors...
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    At the hobby shop I found a similar bottle to...

    At the hobby shop I found a similar bottle to help in my latest shop trick. Rather pricey, over $6 for a "glue bottle" : squeezable plastic with a tough steel applicator tip. Perfect for delivering...
  15. I'm sure someone can expand on this: to the best...

    I'm sure someone can expand on this: to the best of my knowledge, when Marshall started to become a "thing" in the USA, very late '60s, they started to have their amps imported through an agent. The...
  16. Remember that without power tubes installed, all...

    Remember that without power tubes installed, all voltages will read higher than they will with power tubes installed. The current draw of their filaments plus current draw on the high voltage winding...
  17. OK now I know which R we're talking about. It...

    OK now I know which R we're talking about. It wasn't clear, now it is. BTW first time I'm seeing that particular schematic. Notable, the way their draftsman listed "USA variant" parts in a separate...
  18. I agree Helmholtz. Also, what I observe is that...

    I agree Helmholtz. Also, what I observe is that the inverter/driver tube has a hard time driving those 82K's. I often see one side of a sine wave collapsing before the amp reaches clipping. Subbing...
  19. Interesting! Can't say I ever saw 47K's in that...

    Interesting! Can't say I ever saw 47K's in that position. Occasionally 82K though, factory installed.
  20. I thought there might be some howling noise...

    I thought there might be some howling noise coming out of the tank drive jack, but upon reading your edited post #7 seems not. I'll have to keep The Dude's suggestion on file too.
  21. Maybe I missed if you checked this, is some sort...

    Maybe I missed if you checked this, is some sort of unexpected signal being sent out the reverb drive line? FWIW I've had reverb drive transformers apparently with internal insulation breaking down,...
  22. You're way too good at recordkeeping nevets. I'd...

    You're way too good at recordkeeping nevets. I'd have to go thru boxes of paper records. Lucky if I could get it done in a day. And if they demand photocopies of the invoices from Mouser, Newark,...
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    Imma thinkin' you have an EL84 that's on its way...

    Imma thinkin' you have an EL84 that's on its way to going white inside - it has a failed vacuum but hasn't oxidized to the point it's obvious. On rare occasion I've seen similar.

    Of course, I...
  24. Sometimes, to make progress, you have to take a...

    Sometimes, to make progress, you have to take a step backward. Which step ... that is the question.



    OK now you have to get that bias voltage up a tad. Vb somewhere in the mid -50's looks like...
  25. FWIW Fender has been sourcing octal sockets from...

    FWIW Fender has been sourcing octal sockets from Ruby for quite a while now. Maybe 10 years, even longer? So it may not be unusual for other Ruby parts to show up in Fender factory builds.

    I'd...
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    Once again Enzo hits the spot. I have used common...

    Once again Enzo hits the spot. I have used common 1 Meg aud taper pots in Gibsons and other ancient amps where 2M are original installs, no problem at all. Slug one in there and worry no more.
    ...
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    Generally, the better quality VU meters have a...

    Generally, the better quality VU meters have a screwdriver adjustment at the bottom center of the bezel, to set the meter rest point at its no-signal resting point. Give it a little tweak and you'll...
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    No, everything was fine until Mister Shortpockets...

    No, everything was fine until Mister Shortpockets started reading disinformation from dubious "experts" on the interweb.

    Plenty of times I've installed new tubes and come up with less than 100W....
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