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I ran the 721TS another 5 hours today. Ran three movies and film shorts from a TCM DVD.
Electrolytics still fine. Each running cool. Rest of the wax capacitors I chose to reprieve okay. Yesterday when I tested the resistors in the video amplifier, all were within tolerance.
When I obtained this set the width adjustment was set for maximum width. As is, the image on the 10BP4 just fills the mask. Might look around the sweep section to investigate. Certainly the width and height have remained constant over the period of my bench test.
Consider this set sat in a partially insulated attic for over 50 years and the sat in storage for a further seven. I am fortunate it had a quiet existence which may partially explain why much of the original componentry has survived.
Will keep it running to determine if anything will fail. I suppose 35 hours is insufficient to prove that original electrolytics aren't salvageable. So let's give it another 35 hours. I am curious to see myself.
Here are another couple of screenshots from a few minutes ago.
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