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In Reply to: RE: Need help with KT-88 that tests good but plays bad posted by Jonesy on February 07, 2016 at 09:14:23
YES!! Jonesy nailed it spot-on! If that doesn't fix it THEN you can condemn the tube.
Follow Ups:
It could be a dry/intermittant solder joint on the tube pins . I've had issues like this before and it drove me nuts
Al
If you do your own soldering, make certain to use a eutectic alloy. You will encounter far, far, fewer "cold" joints. The least "esoteric" eutectic alloy is 63/37 Sn/Pb.
BTW, don't even think of using near eutectic 60/40 Sn/Pb on PCBs. Where the solder is part of the wiring, as is the case with PCBs, the superior crystal structure obtained from eutectic solder is quite important. The somewhat lower melting temp. helps too.
Eli D.
I use Cardas Quad Eutectic exclusively, not because I believe it helps Sopranos or Bassoons, but because it melts rather quickly, flows nicely, and cools shiny. Not expensive for a hobbyist; $45 for a 1/2 lb. that lasts years.
The sockets are my new favorites with a death grip on the pins, Belton. Inexpensive, decent sized 9 Pin holes, even for TCSS, and a good color to go with black top plates. The total package.
I immediately suspected the bias supply which checked out, then the Taiwan copies of the Western Electric meters and their mechanical connections, fine, then the 8 Pin connections. No globs, no runs, no errors.
Mr. Duttman, you helped out with this design as you do so many others, thank you, and I have to say how disappointed I am at it being briefly out of service. With the EF86 Triode wired, no NFB, and these Gold Lions, it's as close to single-ended goodness as a push -pull design can be....and 25 times more powerful than my 45 amp!
"I use Cardas Quad Eutectic exclusively, not because I believe it helps Sopranos or Bassoons, but because it melts rather quickly, flows nicely, and cools shiny."
Cardas Quad is good stuff. I've used it. When money is tight, you easily get 90+% as good with 63/37 Sn/Pb RA flux core from Kester or MultiCore. Eutectic alloys "RULE"!
FWIW, I can turn my head and stare at a spool of fine wire Kester 44 63/37 Sn/Pb. ;> D
Eli D.
Yes indeed. Or a wire that is broken inside the insulation where it can't be seen! That's why I have all this gray hair...
"That's why I have all this gray hair..."
As a guy with "chrome dome", I say be glad you have hair, at all. ;> )
Eli D.
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