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RE: Learning more about your 5687 tubes...

Posted by Jonesy on April 8, 2021 at 14:38:27:
I was wondering the same thing, but though I have at times accidently set a lower voltage setting with no issues, going the other way could be risky. Sacrificing a tube.

Here's a real good article link I came across discussing the tube itself.

Cheers!

Jonesy