Herman -
I definitely had "hiss"...constant very low level background noise in L channel as I recall. Could really only hear it when the volume was cranked all the way up with nothing playing. It was noticeable however as previously the JoLida had been dead silent. I think in my case, Bless (Erwin) above has hit on it...bad pin connection. Rotating and consequently re-seating all the tubes seems to have made a better connection and fixed things for me.
Jp - Hope you get to the bottom of it and it doesn't prove to be anything major. I'd also check all cables and interconnects. Funny how those things can manage to work loose...but you've probably already done this.
I definitely had "hiss"...constant very low level background noise in L channel as I recall. Could really only hear it when the volume was cranked all the way up with nothing playing. It was noticeable however as previously the JoLida had been dead silent. I think in my case, Bless (Erwin) above has hit on it...bad pin connection. Rotating and consequently re-seating all the tubes seems to have made a better connection and fixed things for me.
Jp - Hope you get to the bottom of it and it doesn't prove to be anything major. I'd also check all cables and interconnects. Funny how those things can manage to work loose...but you've probably already done this.