When I turn my amp on (either standby mode or normal) there is a fuzzy background hissing sound for about 5 minutes, and then comes and goes less and less frequently until it goes away and is silent. The amp works tonally all of the time whether it is hissing or not.
I reckon its to do with the valves warming up, but was wondering if it was a more serious problem.
Its more of an annoyance than a problem though!
PS
To those who were following my progress with this amp before, thanks so much for your words of wisdom- ive learnt a ton from this site and saved myself tons of money fixing it myself rather than sending it off to a tech
NICE ONE!