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Almost all vintage equipment needs to be re-capped and the calibration adjustments checked.
You need the service info of course.
I got a B&K 465 a couple of years ago at a large flea market for $25.
I don't trust the re-store function on it however so I disconnected the button when I re-capped it.
The restore function on any CRT tester is a last resort, they were included in the testers back when new CRTs were relatively expensive (compared to the cost of other parts) but CRTs were available.
The real test is in a TV.
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