I find it odd that the noise goes away if I don't have a guitar on the other end of the cable but do have the noise with no input or with a cuitar plugged in. Anyway, I've replaced the input and still get the noise, can't see any cracks on the PCB but can't find my magnifying glass to check that, think I'm going ot have to refer this to an expert and either pay the money or ditch the amp.
Thanks for all the help
Thanks for all the help