Hallicrafters 505 Soon to hit the Bench

[Notimetolooz]

Originally Posted by jr_tech

I put the HV supply back in its enclosure to observe behavior... no better, HV continues to come and go. When it is working ok, neon indicators show voltage on all coils:


When it quits, the neon indicators next to the higher voltage coils do not light:

jr

I've been away from this forum for a while.
That's an interesting test that uses the neon lamps.
I also have a 505 to restore sometime. I think most sections of the HV coil are wound with Litz wire. I have a spare chassis and the coil resistance on that one measures twice the other one, which measures the correct amount. I wonder if half of the strands in the Litz wire are open. Perhaps the cause of the HV problems is unequal thermal expansion between the wire and the coil varnish or coil form, that causes separation of the strands.
I too am looking to replace the rubber CRT gasket. I was eventually going to make my own. I wouldn't doubt that you may beat me to it because it is on the back burner for me.