Randy, I've had my WA6 for almost 10 years now, and the buzz or hum when first turned on has always been there. It starts when first turned on and then fades quickly as the tubes warm, should only last about 5 seconds, and is typical of tube designs like this. Re the 6DE7, I've never tried rolling them, but Jack does sell an upgrade tube on his website. Not sure about other options, but if you want to do a little research there's a thread on head-fI.org, just search for 6DE7 substitute.
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Tony
D'Agostino Momentum S250 MxV & HD pre; Linn Klimax Organik DSM, SonicTransporter, EtherRegen; Acoustic Signature Typhoon Neo, Koetsu RSP, Boulder 1108; Sf Il Cremonese; Shunyata Everest, Altaira, Sigma & Alpha v2
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