I purchased and assembled a Fender Vibroverb clone kit. When it was all done it had a lot of background hum. I took the amp to two other repair shops in town. One of the shops I took it to were supposed to be hot shot tube amp gurus. The other one was according to them “the biggest and most experienced in town” Both shops kept the amp for about 3 weeks, charged me and said they fixed it, but it still had the problem when I got it home. I took it back twice to the other shops to let them try to make it right, but they could not figure it out, nor would either one of them refund any of my money! Finally on a friends recommendation I took the amp to Allservice, A week and a half later I got the amp back from them and the hum was gone!
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