Name:    Tom Plutshack
Email:   singercircle@netscape.net  
Subject: 212-HD 130 one last question
Thread:  77
Time:    Fri, 20 Jul 2001 15:54:10 GMT

Hi
I'd like to suggest that you do check the bias, at least. Here's why I say that...


I have the head version of the "one-thirty", and when one of the tubes started to get noisy, I bought a new matched quad of Sovtek tubes (the supposedly good ones made at the Reflektor plant)...being younger and inexperienced at the time, I didn't know anything about bias but just threw them in and played on.


A few months later (at a gig, of course), my rig started making no sound. When I got home, I found that one tube was MELTED...yeah, the glass literally melted at one spot on the tube. Not only that, but my speaker coil was ruined, too. I've never found any other problem in the amp other than the biasing.
700V is a lot of volts...