Tommy, Sqjudge has the right idea. I had a Levinson 335 with the same problem, Madrigal technical guys here in London UK suggested the transformer (in my case 4KW) which works perfectly
Fchurtic
Fchurtic
How to get rid of transformer hum?
I have a pair of Pass X600s and an ac line with about 5% clipping of the sine wave. This gives me a large amount of transformer rattle (mechanical hum). I have built a line filter with two diodes and a couple of caps that has gotten rid of 80% of the noise but I'm looking for a inexpensive fix. My power company will not fix the power coming in unless it is clipping by more than 7%. Any suggestions?
Tommy
Tommy