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Old 5th November 2008, 07:45 PM   #11
diyAudio Member
Join Date: Feb 2008
Thanks for the input, I think I will go with the EH KT88's. Probably order them from Jim McShane. Still a few weeks from making the final determination.
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Old 10th January 2010, 05:22 PM   #12
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Join Date: Mar 2009
Location: Everett, WA
Default JJ KT88's internal short/fail?

About a year ago, I purchased a matched pair of JJ KT88s from Triode Electronics. About two weeks ago, I noticed the inside of one tube glowing brilliant white. Looking inside more closely, the grids were glowing white. I swapped the tube positions, and the problem moved ... so I know the tube is suspect.

Grid bias set for cathode at 1 volt. Basically a stock amp but with the filter cap board upgrade from Triode and a silicon diode replacing the selenium. All PS voltages are at spec.

How often do JJ KT88 tubes have this kind of failure? I wrote to Triode but do not have a reply yet.

I did not physically remove the ancient can electrolytic in-view. But, it's disconnected.

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File Type: jpg JJ KT88 - White Hot insides.jpg (158.8 KB, 34 views)
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