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In Reply to: RE: JJ Octal based tubes posted by Michael Samra on April 24, 2014 at 22:52:57
No i do not have problems with JJ tubes.
As reseller i have distributed hundreds of tubes the last year, three
has had problems ( one 6l6 with glowing screen, one 6550 with broken glass and one el84 that was way to high idle current. One powertube has been replaced for my customers, and 2 preamp tubes.
Follow Ups:
That makes me wonder because I talked to Tomas at JJ a few times and he seems oblivious to the problems with the tubes. CE is the main distributor in the US for JJ tubes and it makes me wonder if they were buying rejects or factory seconds if that's possible? If you would have seen some of the JJ KT77s I got,the bottle was tilting about 10 degrees to one side and others flashed and ran hot.
Honest amplification is better than excessive 2nd order distortion anytime.
My experience with JJ's KT-77s was much like your Mike. I didn't note if they were leaning, so I can't be sure about that. I used the KT-777s in a small =35wpc PP integrated with 2 tubes per channel. After very few hours one arced and took out it's circuit which I had a pro repair. He asked what the F did you do?
OTOH I have had E34Ls blue glass that lasted for years no red plates, arcs, noises etc. etc. They just died with nary a wimper.. I dunno if they have better QC on the purely cosmetic blue tubes as that may be "true true and unrelated."
Steve
I recently tried the JJ 6CA7 and have had no issues. Perhaps the QC has improved?
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