Quote:
Originally Posted by Username1
Originally Posted by old_coot88
A possibility: the 'gradual fade to nothing' could be caused by a 'floating grid' condition of the output tube. That's where an open (or misconnected) grid resistor going to G1 of the tube allows the tube to gradually self-bias to cutoff.
Does the audio become distorted during the fade, or remain undistorted?
I agree 100% Look at this first.... Bad resistor, possible coupling cap bleeding
some DC to the grid....
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The audio fades from normal over about 10 seconds to nothing. As it is fading it seems to get muffled as well. When audio is gone there is a slight muffled humming. When the audio comes back, it suddenly pops back in at normal. Not distorted coming back. Just bam! Back. It only does it once each time I turn on the set. Last night I turned on the set around 7 PM. For the first 5 minutes or so that the set was on, everything was normal. Then the audio faded out. Was gone for around 3-4 minutes, then popped back in. The set remained on until 9:30 PM and operated fine. Does this every time I turn on the set.