Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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RE: JJ 300B Quality and Reliability?

Posted by mikeyb on September 2, 2008 at 20:22:44:
One of the pair of JJ300Bs that I had developed a heater to grid short after about 100 hours of use. I have had better luck with the gold grid EH300Bs that replaced the JJs.