tube upgrade for first sound

weird. never had this happen, but those tubes cant be bad. do you have a swap tube to try in its place - justy to see if it goes away?

Otherwise, you should call emmanuel

Artg has it right. Swap the two left channel tubes and the two right channel tubes. If the distortion moves to the left channel, you know it's one of the tubes. To determine whether it's the OA2 or 6922 tube, swap them with their partner one at a time.

If it's not a tube, call Emmanuel.

I'm having the exact same problerm with a new pair of EH6922's. Sometimes
tubes go bad well before their time, I guess. Maddening.

I'm almost certain it can't be the OA2, which is not in the signal path and thus
can't create the kind of distortion you (we) are hearing.

Thanks Drubin

I guess I'll switch the stock tubes, with other tubes I've been collecting, to see if the distortion stops.

Good point, about the OA2 not being in the signal path. Please post again with what happens in your FS.

Thanks
Paul

well, well, well, here's a gem for the taking....

http://cls.audiogon.com/cgi-bin/cls.pl?preatube&1118799988