Another thing to try would be to remove the tube shields, power on, volume low but not zero, and with one finger on the pointy tips, gently wiggle the 9-pin tubes one-by-one in a small circular motion. This will perhaps indicate if there is a contact or two on a single tube socket that just isn't making a good connection. Be gentle, you're trying to move only one tube at a time. It also might indicate a broken solder connection right at one of the tube-socket pins.
The effect you noticed (the blue glow) on the 6V6 is perfectly normal. In fact it's considered sign of a good vacuum. You say there is "no bias voltage". Something does not compute. Without bias, those 6V6 tube plates would glow good and red hot almost immediately and perhaps blow the fuse. In fact...you'd WANT the fuse to blow.
Another thing---check to see that the 470 ohm screen resistors mounted on the 6V6 sockets are still in one piece. These R's run hot..and they're also heated by the natural heat for the 6V6 tubes. I have seen these resistors hairline-cracked all the way through. After 45 years, it is very common that they are dried out and embrittled. Under these conditions, the two halves will sometimes make and sometimes NOT make a connection....and the vibration of the whole amp under the influence of the speaker can make/unmake the connection. Very often, such a crack is simply invisible. With power off, just exert a little sideways pressure on the bodies of these R's. The same thing can happen with the B+ dropping 1-watt resistors under the doghouse on the top of the amp. Or...did you replace those? And finally, the same thing can happen to the 100K plate resistors, the brown-black-yellow pairs arranged in that "V" formation. If those plate resistors are old, I myself like to replace them (all of them) with the metal film 3-watt ones Doug sells. It cuts down massively on hiss, dramatic improvement for $2 of parts. Anyway, on the 470 ohm screen R's---I have seen those look perfectly fine, then push on the side, and one half of the R just swings away from the other half.
I remember when those amps were silly common and could be had for $150 all day long, as many as you wanted. They were scorned because they didn't have enough power. Now they're in fierce demand and fetch silly-high prices. I had a beautiful one that I left with a friend when our business dissolved ~~30 years ago. Sigh. I have an AB763 silverfaced one now. There's no question, they are simply great amps!
Topic: Help trouble shooting 65 Deluxe Reverb (Read 5824 times)