1 mark tonelli 6 years ago One day I turned on my newly purchased 64 Blond Bassman amp and there was a great hum then a burnt smell that came from the 2nd power tube socket. Now all I had was hum. I opened it up and could not see anything. To say the least I was disappointed. Other friends with vintage amps told me how when their amp broke they were told by the tech that the power or output transformer had overheated and blown up therefore needed replacing.A friend of mine with a 1956 Fender amp got his output transformer rewired and the sound was totally screwed when he got it back. I rang around and was getting the same sort of thing.”probably your transformer” A couple of friends of mine who are electricians said it was extremely highly unlike the transformer would blow, and if it did, I would know about it with black smoke coming out of the amp. A GDP member who knows these amps extremely well told me “your transformer is fine, they’re almost impossible to break”I thought, “ok, lets go back to basics” Upon testing the original speaker cable from the head to cab, I discovered a short. It was an intermittent depending on what angle the cable was twisting. I was told a short in the cable could blow things up. To cut a long story short I replaced the cable, put a new tube in and presto! All fixed It seems the tube had taken the brunt of the short.A broken transformer seems to be commonly used money-spinning trick by dishonest techs and a commonly believed myth guitar amp owners beleive including myself up to now. Don't let anyone tell you your transformers screwed without proving it to you! Cheers.