Quote:
Originally Posted by init4fun
If you only measured the B+ with the sweep tubes removed and not with them in place that would easily explain the 100 volts too high reading . Also , many times arcing in the neck is an indicator of a gassy CRT . You may want to determine if the CRT is actually good , or if not that you can source a good replacement , before spending the cash to recap & restore the set ....
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It does explain the high voltage? I thought that was more common with PWM power supplies but that's good to know!
Yeah, I want to get it basically functioning before I consider any recapping. So I measured all the various sources with the sweep tubes pulled again and they check out OK if I supply it with 100 VAC. Nothing runs too hot, so I put the tubes back in and fired it up with 100 VAC. I got a bleak red-tinted raster so basic functionality is there.
Once things started heating up the B+ also dropped and I could increase VAC to 110VAC without any arcing. So perhaps there's still live in it. The set doesn't look high hours to my untrained eye, but I don't have any equipment to measure the tubes or CRT so I'll just try and see if I can get a basic picture out of it.