Puddleglum
100+ Head-Fier
- Joined
- Mar 3, 2004
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Okay I ordered 10 sovtek 12ax7lps for my fisher 400 (1 spare) and four Electro-Harmonix 7868's. When I plugged everything in, I found that there was a scratchy/staticy sound coming from the right channel. That sound is non-existant when I first start it up, and gets louder the longer it's on. So I figured it was one of the 7868's and sure enough, one of them was lit up a little bit brighter than the others. So I turned it off, let it cool off, and then switched the output tubes to see if it was just the tube or the socket. It turned out to be the tube and not the socket because the same thing happened to that particular tube.
Are these the symptoms of a microphonic tube, or is it something else? Should I order another pair of 7868's?
Are these the symptoms of a microphonic tube, or is it something else? Should I order another pair of 7868's?