I just picked up the following amp: To be from 1962; it is in amazing condition; to include the original manual and footswitch, and an aftermarket cover. Anyone familier with these? Tube recommendations? Speaker recommendations? (it has 6bq5's for power tubes/EL84's; 6eu7's for preamp, and a 6ca4 phase inverter tube? And a 12" speaker). I want to get it sounding better---don't get me wrong--it sounds pretty good now----and the tremolo is awesome---but it has the original tubes and I think a tube change would help lots as a better 12" speaker would too.... Anyone??