Pro Audio Asylum

RE: Ampeg SVT4 pro hum

63.247.31.12

In Reply to: RE: Ampeg SVT4 pro hum posted by Pro Sound Guy on August 10, 2009 at 12:57:15

Sorry, not familiar with later model SVT's. Just the old 6146 and 6550 loaded head units. Have worked on 7027A Ampeg amps (very nice and loud). And the smaller 7591A Reverborockets. Ampeg seemed to change circuits as the amps rolled down the assembly line. I've seen 1962 R-rockets with solid state bridge rectifiers, GZ34's, 5Y3GT, 6V6GT or 7868 power tubes, all labeled RR 12RB's with the linked schematic pasted in the cab. :^)

I've been kicking around the idea of DIY a R12R clone with 6SN7 and 6SL7 front end/effects/tone. GZ34 rectifier. And 7591A power tubes. The 7591A in Class "A" cathode biased is quite a tone monster. I have the tubes and iron parts... one day.
http://www.prowessamplifiers.com/schematics/ampeg/Reverb_Roc (Open in New Window)

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