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In Reply to: RE: EI Kt90 posted by setlow on August 05, 2014 at 11:02:09
Thank you for the information. I hope the picture could identify them.
The one that shorted blue to of the caps in the auto bias circuit, which I replaced. The amp is an Art Audio concerto 11 which I like very much.Now using EH kt90 from Jim Mcshane.
Bob
Follow Ups:
Those are type III, the "wings" on the plate are what to look for. I wish I has one to send you, but I don't.
BE CAREFUL!! All but the earliest production type IIIs had misaligned screens and are prone to both red plating at about 50% of rated dissipation and they'll have higher THD to boot.
Thanks Jim, appreciate your help. Now all I have to do is find one.
I ran them for a while before the short and did not notice any red plating.
Bob
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