VA62 barsweep

[JohnCT]

So yesterday an old friend long retired from the business stops in for a visit. I haven't seen him in a few years and almost didn't recognize him with his long hair. Can't wait to get *my* mullet chopped off..

So he said he had something in the car that I might want. It's a VA62. Sure Tony, I'll take that! He also said he had a picture tube restorer and is going to drop that off. It's probably a B&K 467 (I have three of those now) but it might be a Sencore as well. Anyway.

I have a VA48 that's partially functioning, so this was nice to get. This one is *well* used, but I tried it out and everything works except the built in DMM, which reads either zeros or some random number. It does say "DC" or "PP" as required by the function switch, but doesn't read. Not a problem as everything else works.

But I'm intrigued by the bar sweep. I scoped the output of the bar sweep function at the video output jack and found each of the ten stops is virtually flat from .5 to 4.5mhz.

I've heard that Sencore used to say that an IF alignment could be done by watching this bar sweep waveform at the video detector, and not using the shaped curve with markers. Has anyone tried this?

John

EDIT: I don't think there isn't a switch or control that isn't flaky. I spent about a half hour constantly pushing and rotating every movable item to get it to settle down some. I have a Sencore Z LC75 that I bought new in 1985 and use it every day, and the controls are perfect. This might have sat for a decade or two before I tried it yesterday.