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#1
05-05-2017, 08:49 AM
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Yes, it uses a stacked supply. You should have about 140 volts on the cathode (pin 1) of the 6AS5.
The contrast control which varies the gain of the video amp is tied to that point. 
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#2
05-09-2017, 10:39 AM
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OOps. You're right. Thanks for the reminder. Maybe that filter there went bad. Thanks for helping me.
Bill Cahill
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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