Dropping the B+ voltages....

[johnnyreece]

Just something else to throw out; I had an old Crate VC50 that ran with a B+ of 391.

Also, is your B+ that high, or is it your actual plate voltage (measured between plate/cathode)?

[Paultergeist]

All, this is really great information, and I very much appreciate the dialog and suggestions.

Also, is your B+ that high, or is it your actual plate voltage (measured between plate/cathode)?

That is a good question.....the amp was making a lot of "snap, crackle, and pop" sounds along with intermittent guitar signal during the short time I ran it. If memory serves me correctly, I probably just measured from plate to chassis ground, just to get a quick idea of voltages. I have pulled the cap cans from the rectifier (voltage doubler circuit) as well as the three axial caps that feed the power rail -- once I get those electrolytic caps replaced, I plan to try to fire it up again. I'll get some better voltage readings at that time.

This -- I must admit -- has not been a very scientific diagnostic process on my part, but at 50 years of age, I figured it was a pretty safe bet that the big electrolytic capacitors along the power supply rail were due for replacing.

Thanks again to everyone for the great ideas and assistance.

[Paultergeist]

*delete duplicate post*