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Re: Back to the Drawing Board....

Well, it went about twice as long this time, so I guess we are making progress :) . I took the resistor out and took the CT to ground and I adjusted the bias so that it read -110 between the grid and the filament of the 845. I ran it for about 7 minutes with the preamp out and everything seemed ok so I decided to put the preamp back in. It ran for about 5 minutes with the preamp in before making the noise. Guess I had better go back and let it run 20 minutes or more with the preamp out and see if it goes bonkers then. The thing I don't understand is why it doesn't start making the noise right away. Why does it run awhile first?
I'll report back after running it without the preamp for awhile longer.
Vince

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