Quote:
Originally Posted by vts1134
is there a way to isolate every thing upstream from the 6SN7 sync amp/separator to quickly confirm this? Would removing the video amplifier tube achieve this?
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You can isolate everything from before the video amp by lifting the grid connection (V105 pin 1), then injecting composite video right into the video amp on pin 1. If the problem goes away, the issue is in the tuner/IF. If you remove the sync tube, the picture won't lock at all and I think it would be difficult to tell if there problem were still there or not.