Quote:
Originally Posted by JohnCT
Maybe I missed it, but have you tried another source besides the VA48? I have two and both had issues with failing bypass electros in the power supply and on the generator boards.
John
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My scope at input (6KA8 pin 6) shows a very noisy video with AC riding it. I assume the noise inverter is meant to clip video, leaving clean sync pulses.
EDIT: Relatively good 6 V p-p video going into 6LF8 pin 2 and then odd stuff at the plate pin 9 at much higher amplitude. The screen grid bypass cap was replaced early on, as it causes these issues in older chassis using a 6AW8.
I will put the VA 48 on a '70 Zenith 16" color and see what its does. It was fine when I was working on a Zenith last month. I have three more orange and maroon drops to try then I give up for now.
EDIT : The Zenith shows a normal picture with fill range of output, and the RCA 16x looks equally un-synced with an air signal .
This is going nowhere
, so I change chassis and go back 3 years to a simpler RCA design with a few less "features" in its circuits
.