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JJ Octal based tubes

Posted by Michael Samra (D) on April 24, 2014 at 22:52:57

JJ is a company that needs to get it's SH-T together on quality control of it's octal based tubes.I don't know how a company that builds such wonderful sounding tubes as JJ does can have so many failures.That EICO amp I was running E34L tubes in and they sounded wonderful but one of them would separate from the cathode after being on for 20 minutes and lose power.
The funny thing is,the tubes they make for other companies such as Groove tubes don't seem to have quite as many issues..They made the KT88SV for Groove tubes and they also made the E34LS for Groove tubes but it was Groove Tubes tooling and design, and it's a 30 watt tube as opposed to the E34L which is JJ's design that's a 25 watt tube..

I'm starting to wonder if people in Europe have the same reliability issues with JJ octal tubes that we do in the US? They had so dam many tubes come thru with crooked bottles and flashing in the wrong places and microphonic as well.I had the E34L in my stash for 6 years since new and I don't have 50 hours on them and two of the four have issues.The KT77s came thru originally with crooked bottles and under sized pins.

I think their failure rate seems to be in the 50% range within the first two years. Any thoughts?

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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