Just bought a Cornell Dubilier Capacitor Analyer Model BF-50

[vortalexfan]

Hello Everyone, today I just picked up on Facebook Marketplace a Cornell Dubilier Capacitor Analyzer Model BF-50 and I was wondering what the concensus was about those as far as how they compared to the Solar version and the Knight and the Heathkit versions of the Capacitor analyzers?

The one i just bought is going to need to be electrically restored as it currently isn't in working order but it looks pretty straight forward and it looks like its all there, I paid $50 plus shipping for it so I don't know if that was a good price or not, but it seems like a pretty good deal to me compared to how much I've seen working Knight and Heathkit ones going for on eBay.

Any information would be appreciated.

Also how common or uncommon are 12A7 rectifier tubes? I'm curious because that's what this capacitor checker uses and its missing that tube.