Mesa Tubes Bias help

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BrentSSL
Mark III
Posts: 311
Joined: Wed Sep 07, 2011 1:22 am

Mesa Tubes Bias help

Post by BrentSSL » Mon Feb 04, 2019 11:53 pm

Okay so I bought a Mesa rectoverb head series 1 from my local Guitar Center recently. The guitar amp has been modded slightly it has an el34 6l6 aftermarket switch. It also has a jack labeled vintage modern on it which could be a foot switch according to Mesa. The guitar amp did not have Mesa tubes in it. However it shows no sign of a bias mod except for the switch. They say made in Russia el34 0306 and I think they are Svetlana electron tubes. When I took it apart I could not find a bias pot. Are those tubes within the Mesa fixed bias range? Or are they possibly just thrown in there to work? Currently everything works fine but I'm more of a fan of 6L6 tubes I would like to put a matched pair of Mesa tubes in there. Any help would be appreciated.

BrentSSL
Mark III
Posts: 311
Joined: Wed Sep 07, 2011 1:22 am

Re: Mesa Tubes Bias help

Post by BrentSSL » Tue Feb 05, 2019 7:27 pm

Anybody?

silentbob
Mark II
Posts: 88
Joined: Tue Nov 18, 2014 11:09 pm

Re: Mesa Tubes Bias help

Post by silentbob » Thu Feb 14, 2019 5:38 pm

Without knowing what mod was done, there is no way anyone can really tell you much. I would take it to a decent tech and have them look it over.

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