I have not checked any voltages yet. I wanted to have at least one replacement for each tube type used in the tuner which I will in a couple days. You might very well be onto something there. I noticed that when I flex the chassis slightly while listening to the static, I can create some pops and changes in the volume of the static. If I select an audio source like AUX or Tape Mon, I do not get any noises doing the same. I was picking up the unit to put it on it's side which is how I flexed it and noticed that issue. That's the first thing I'll look at are heaters and socket voltages. Thanks for your suggestions and insight!