How to identify a failing Cathode Ray Tube?

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43.8 and 93.5 are pretty good accuracy, when you consider electrolytic caps (or older types at least) can be -20% to +50% of the specified value right out of the factory.
But yep, looks like you've found one culprit. Interested to know if that was the only problem.
 
Seems crazy to only check ESR. If the cap is short circuit it will by definition have low ESR, but be completely useless. There are other parameters you can measure (apart from the value) but that's all getting a bit specialist...
 


Feeling like I've earned some proper man-points today! Thanks for the help everyone, I've learned a hell of a lot!

The problems were indeed all located within the power supply - almost all the caps were a long way from spec, there were some dry-joints, and I found a resistor with a crack in it. I replaced all the failed parts, re-soldered joints, cleaned and reassembled, then fired it up and it's needed no further adjustment

Playback is from the RGB output of a Sony Digital Betacam deck (16:9)

Thanks again all!
 
Tom Vaughan-Mountford said:
I got the Digital Betacam deck at an auction, it used to belong to ITV, I picked up for just £60 - original price was circa £30,000
Click to expand...
The company that I worked for designed and marketed a radar recorder based on the Sony Betacam. The Betacam was a fantastic piece of kit for the time and, as you say, cost the earth.

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