Grounding Problems?

[Jazzmasterfan]

I've recently returned to playing guitar after a long break. My old amp is a Marshall VS65R Valvestate and I noticed a few months ago that it hummed quite badly on the clean settings. I put this down to the fact it had been inactive for about ten years and spent five years in the garage. I used my Jazzmaster through it (which had just been serviced and new pickups put in). I took the amp to the local guitar amp repair man and he resoldered everything. When I picked it up from him, he played his guitar through it and there was no hum whatsoever...clean as a whistle.

About two months ago I bought a Line 6 Flextone III brand new (to use for gigs). When I tried this out, I noticed that this hummed on every setting. I did a bit of research on the www and noticed that it could be grounding problems and perhaps I should try it out in other parts of the house etc.

Anyway, I have now tried out my Marshall on the clean settings and put my Jazzmaster and Fender Telecaster Deluxe through it and it hummed all the time. I've tried two rooms now and the humming is there.

The guy I bought the house from was a DIY nut (and not a very good one) and I have had to get large parts of the house re-wired by professionals because of his amateur electrician attempts.

I presume that my humming problems are almost certainly to do with the electrics of the house? Anybody got any different views or maybe got some ideas how I can stop the amps humming?

Cheers

[Bacchus]

Wrap the amp in tin-foil? Or wrap yourself in tin foil. Maybe both.