I talked with Bill Sundt and he told me that unless you are opening up the master volumes, which is pure insanity since this amp will sterilize you wide open, the preamp tubes affect the tone alot more. He said they use Sovtek 5881's. So I just went to the tubestore and bought them. They were alot cheaper than the Winged C SED's by about $40 for the matched quad. Bill told me that they have had real good relability with the Sovteks. I changed the 12Ax7 in V2, which is for the overdrive channel, from a Tung Sol to a NOS Telefunken and it really opened up the tone and made it more aggressive. Excited to see how it sounds with brand new power tubes as well. Should get them next Wednesday or Thursday.
Chuck