I was listening to whatever that was on the FM dial, through my Roberts (Akai) tube monoblocks. When the right channel started making that blasted noise again. The left channel sounds beautiful and so does the right------sometimes. I've replaced so many parts, I nearly have a new amp.......AND STILL!

I guess I'll replace resistors next...........
It's kind of a scratchy, crackley noise, that's independant of the volume setting.
Hope it isn't an output transformer.......I have some in the parts units I could swap in, but, that 's a pain. And they're just as old.
Dave