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Posted by Mark B (18.104.22.168) on January 30, 2004 at 00:01:29:
I have an early 90's SVT 3. When the High treble boost is ativated there is major hiss and when I lightly tap on the top of the amp it almost sounds like a tamborine. The amp is totally usable as I never use the "high boost" or the low boost for that matter. Something is funky though.I need to take it home from the practice studio and open it up and check the pre-amp tubes. I have never replaced or even checked them in eleven years. Could what I disribed be a microphonic tube or two. Any other ideas would be appreciated. I run this amp through the Ampeg SVR 215. A 2-15 back to back w/ rack.
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