I bought a pro jr last year and have since basically lived with the hum and hiss and have minimized it, although it's still noticeable when recording (which is basically why I use the amp ). I have separated the wires as mentioned on many internet forums already. That did nothing for the noise for my particular amp. Today I tried moving the tubes around and noticed that it might be the v2 socket thats making all the noise. I've been experimenting with this by taking the same stock tube (GT 12AX7) and moving from V1 (absolutely no noise) to V2 (noticeable hum). Is this the symptom of a dirty tube socket or something else?