I have some "white noise" in the right channel that is most noticeable when set to phono and the volume turned full up. I swapped a few tubes around and cleaned the sockets but there was no change. I can also hear it on my headset that is run off a head-phone amp connected to one of the tape-outs and the selector to a non-phono input suggesting the noise is located in the line-stage section. Could this be a failing cap? Any suggestions would be appreciate. I should mention that at normal listening volumes the noise is only apparent next to the speaker. I have the gain set at 14db.