Hey guys, I have a 1981 2204 that I recently had serviced, which included new filter caps, screen grid resistors, bias supply caps and new tubes (Ruby Tubes 6550's and 12ax7's). I know these amps aren't considered high gain, but the amp seemed to have hardly any before the servicing, which I thought was just due to age/wear/old tubes. However, after the work was done, it still doesn't seem to have much gain at all. Could there be something else that needs to be replaced that was overlooked? Any help or suggestions would be greatly appreciated.