1968 Zenith 20Y1C50 chassis - advice needed

[joe111671]

Focus voltage at the yellow wire was 4KV. I lifted it and the voltage went up to just under 5KV.

Hooked that back up then lifted the black wire, and the focus control center pin measured between just under 4KV to just above while adjusting the focus control.

HV at the 2nd anode is 26KV so that should rule out the 6HS5 tube.

So at this point I think I just need the stick.

Originally Posted by Electronic M

The old selenium focus rectifiers tend to fail by increasing their internal forward resistance.

I can get a NOS ECG118 for $5.50 shipped. Do these have a shelf life, or am I good with NOS? I'm hoping Chester's still has one so I can just drive over and grab one.

Originally Posted by nasadowsk

Hissing isn't normal. Clean the HV box by the rect up.

Will do.