[Humptydumpty]

Radio Dave . I think the reason for the hum is the mains 240v transformer .With the set on and speaker removed , i can hear a noise from the main transformer . I am sure its the problem .I said before that i would remove it and take a good look inside ,i did not . .And i dont know if i could de solder all the conections on the base of the transformer to remove it.And re fit it again after . So i am looking at removing the transformer if i can. I have made the laminations and built the ransformers and assembled them in past employment at the BSR .The problem is the laminations go loose inside .And its only varnish on the steel coils we used to pressed the laminations out of . David thumbs up for that,, i will do what you said and isolate the transformer . .Good idea .Watch this space .