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Post subject: Super sonic
Posted: Tue Aug 14, 2007 10:18 am
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Joined: Mon Aug 13, 2007 12:50 pm
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Need a little help with a super sonic combo amp.. It is a 60th anniversary model ( great amp) Starts to hiss after about an hour. less on the clean side more on the burn side... Which direction do I go?? Power tubes or preamp tubes.... Any clues would be appreciated.

Thanks !


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Posted: Tue Aug 14, 2007 12:25 pm
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Joined: Wed Aug 08, 2007 11:02 am
Posts: 123
Hi - I'm not an amp tech, but I know that hiss problems are hard to pin point, and the process of elimination from least expensive to most expensive, trial & error, is the best approach. First thing to try generally is to eliminate effect pedal and plug it straight to the amp. I had a hiss problem myself , it was not consistenly hissing, so I thought it was my SS amp, and finally narrowed it down to my Dunlop Uni-Vibe that is hissing occasionally - not sure why, but I've read other reports on the net that those babies sometimes decide to hiss for no apparent reason.

Assuming you have eliminated the effect pedal possibility, and based on the fact that it only starts after an hour or so, and on the burn channel only, the second thing I would do is swap the pre-amp tubes, more specifically the ones in V1 & V2. You may want to swap them with other 12aX7 already in the SS, or buy two pre-amp tubes, but I would try the swapping first.

Keep us posted on how you made out !

Tweed Dog Steve


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