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Post subject: Loud Hiss-Supersonic
Posted: Tue Sep 23, 2008 9:10 am
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I just bought a new Supersonic head. It was DOA on arrival, as 2 of the preamp tubes were broken in shipping. I replaced all the tubes with the same Groove tubes. The amp has a loud hiss when in the "Burn" channel mode. Is this normal for this amp? I read some have complained about hiss when using the effects loop, but this hiss is constant, with no effects loop being used. So much for using this amp for recording. I really like the amp tone, but the hiss is just terrible.


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Posted: Tue Sep 23, 2008 1:29 pm
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Joined: Tue Sep 23, 2008 1:01 pm
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Location: Birmingham Alabama
Make sure that the PI is a 12AT7 not a 12AX7. If it is the factory correct 12AT7 GT rebranded Sovetec then try swapping the PI for a higher quality 12AT7. I had a NOS RCA 12AT7 Blackplate in the PI slot on my Super Sonic head and that did WONDERS to lower the noise floor!! Mine was almost dead silent even at higher gain levels on the crunch side!!
Also these amps need to be warmed up a bit in bias from the way they come from the factory for the best tone and respond well to an overall tube upgrade.


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Posted: Tue Sep 23, 2008 1:41 pm
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Hey, thanks for the suggestion! I'll try to find another 12AT7. I just ended up popping in another new Groove Tube 12AT7, so I'll see what I can dig up for an alternate.


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