Thanks for all the suggestions so far. Tried changing the position of the phase and neutral (I live in Sweden where we have 230 V. That is, rotate the plug in the socket. Now it was completely silent, tried to change back and the noise occurred again. Changed again and dead silent again. The problem is fixed . Many thanks for all the suggestions. Regards Niklas
Tubes trouble?
Need help and advice.
Have an ARC PH5 Riaa where the tubes were changed two years ago. Sometimes when I play there is a humming sound that changes character when I put my hand on the cabinet and all of a sudden I am completely free of interference again. Where do I start? Guess it's a tubes that's bad. How do I find which one? Can I change just one tubes or do I have to change all of them? Is there any placement of the four that is less critical if a pipe is in worse condition? Thanks fore comments and tips. // Niklas