Capehart 325 restoration

[bandersen]

I finally got back to working on this chassis

The ceramic HV cap on the damper tube has been replaced and a new HV anode lead installed.





I also installed a genuine Farnsworth 160AR CRT I stumbled across on craigslist.

It had no trace of any external coating but I did fine a ground spring on the chassis so it probably should have one. I went with a temporary one made from aluminum foil and tape
If I get it working, I'll coat it with some Slip Plate.






The old hardened tape was replaced wit some cloth tape.


While I had the brackets off, I finally found the chassis revision number - C-281.


TIme to fire it up again.

[Electronic M]

Originally Posted by bandersen

TIme to fire it up again.

Did you connect that HV lead before the power up, or was there a brief lightning show before you noticed?

[bandersen]

Originally Posted by NoPegs

Sooooooo, are we listing the HV lead as the culprit? Glad to see that you climbed right back up on this horse and got rewarded with some success.

No, unfortunately replacing the HV lead had no effect. The HV is still about 20% low and for a while it dropped down to only 5 kV. Still not sure what the problem is. Also, I just discovered the sporadic arcing is actually inside the electron gun. Maybe there's a loose bit of metal ?

Originally Posted by Electronic M

Did you connect that HV lead before the power up, or was there a brief lightning show before you noticed?

Yes, I did remember to connect it up