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.

[jr_tech]

Originally Posted by Notimetolooz

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.

Still working on it... hobby plastic attempt was a no-go... second idea involved left-over garage door weatherstripping shows some promise. Cross section of the weatherstripping was about correct to cushion the front of the CRT, and provide a decent outside trim.



I cut the weatherstripping to the correct length, formed a circle and glued the ends together. Followed up with several thin coats of flat black rattle-can vinyl spray.



I likely will try to fabricate the 3:4 mask out of hobby plastic and glue it to the weatherstripping. Still a work in progress, and far from ideal, but it's better than nothing.

jr

[decojoe67]

Originally Posted by jr_tech

Still working on it... hobby plastic attempt was a no-go... second idea involved left-over garage door weatherstripping shows some promise. Cross section of the weatherstripping was about correct to cushion the front of the CRT, and provide a decent outside trim.



I cut the weatherstripping to the correct length, formed a circle and glued the ends together. Followed up with several thin coats of flat black rattle-can vinyl spray.



I likely will try to fabricate the 3:4 mask out of hobby plastic and glue it to the weatherstripping. Still a work in progress, and far from ideal, but it's better than nothing.

jr

Excellent work on that mask so far. It should do fine until a replacement turns-up.