valve brands for fender amps?

[tomfarnan]

Hi, can someone enlighten me as to what the differences are in available brands of valves for fender amps? I have just bought a Princeton (BF) and a Vibrolux (SF) and am completely clueless as to what versions of 6v6 valves and gz34 and 12ax7 valves I should buy.

[tomfarnan]

Has anyone tried TAD tubes?

http://www.tubeampdoctor.com