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In Reply to: RE: More bias troubles with Treasure Black bottle tubes.....I give up posted by Mendel on September 24, 2016 at 19:35:53
Is your amp prepared to use kt-66 ?
To qualify the grid leak must be < 100kohm when using fixed bias
https://frank.pocnet.net/sheets/086/k/KT66.pdf
If using higher grid leak the tube may be unstable, it's certainly
outside spec anyway.
Follow Ups:
Thanks for the posts guys.
Yes tubular, my amp can use KT66 and have been using Gold Lion KT66 recently and GEC KT66 for many years without problems.
I obviously got a bad batch of tubes. Seem to be a lot of bad batches of these "premium" Treasure tubes.
mt
I am fully expecting to return them to PartsConnexion for exchange. Will probably just get another quad of GL KT66- they sound good and have been reliable so far (about 150 hours)
OK, good! I haven't tried those Gold Lions, yet. But, every new issued GL seems to be pretty good stuff.
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