tube upgrade for first sound

Give it a month so that you really get to know the sound of the broken in unit before you start experimenting.

Ok Fellas....What are the signs of a tube going bad? I am getting a distortion in the upper frequencies in the right channel of my new FS Pres. Deluxe MkII. It has happened within th past two days. Certain High pitches (piano music, flute/piccolo) Cause a slight fuzziness in the sound. It also sometimes sounds as though, a single note is seperating into 2 pitches.
I've ruled out the speakers - swapped them and it still does it. Ruled out the source - 2 different scources do the same thing. When I play my HT preamp (Lexicon MC8) on the same music, the distortion goes away. :-(
Besides a tube, going bad, I don't know what else it could be.
Do any of you fellow FS owners have any Ideas?
Any thoughts would be appreciated.

thanks

Paul

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

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.