Resistor or jumper at hv rectifer socket: Zenith 25mc30

[NewVista]

Does the Goodman manual say anything about vert foldover?

I left the new 1.5k (2w) resistor in as it was reassembled.

Still have my H-synced artifact on screen which can be heard in speaker also, seems to be a micro arcing in some component getting into the RF then onto screen - more pronounced as you fine tune into chroma/sound

[dieseljeep]

Originally Posted by NewVista

Does the Goodman manual say anything about vert foldover?

I left the new 1.5k (2w) resistor in as it was reassembled.

Still have my H-synced artifact on screen which can be heard in speaker also, seems to be a micro arcing in some component getting into the RF then onto screen - more pronounced as you fine tune into chroma/sound

I'm the guy who's guilty of replacing the resistor on the socket I sent to tubejunke. I wanted to get it in the mail in a timely manner. I only had a 1.2K 2W res on hand. The socket I got had a jumper.
I recall, that I inquired about the resistor at the Zenith distributor. The head technician said, just to jumper it out. It's not needed anymore. That has to be 40+ years ago, before I bought the Goodman book.

[Zenith6S321]

Originally Posted by NewVista

Does the Goodman manual say anything about vert foldover?

I left the new 1.5k (2w) resistor in as it was reassembled.

Still have my H-synced artifact on screen which can be heard in speaker also, seems to be a micro arcing in some component getting into the RF then onto screen - more pronounced as you fine tune into chroma/sound

Here are the Goodman service tips that include the 25LC20. The fifth page describes an arcing issue. I will send the last page of this in another post.

Dave

[Zenith6S321]

Last page.

[NewVista]

Originally Posted by Zenith6S321

Here are the Goodman service tips that include the 25LC20. The fifth page describes an arcing issue. I will send the last page of this in another post.

Dave

Thanks for extra pages and tips! Lot to try here.

[Zenith6S321]

Originally Posted by NewVista

Does the Goodman manual say anything about vert foldover?

I left the new 1.5k (2w) resistor in as it was reassembled.

Still have my H-synced artifact on screen which can be heard in speaker also, seems to be a micro arcing in some component getting into the RF then onto screen - more pronounced as you fine tune into chroma/sound

The Zenith 29JC20 service manual says:

"The most common cause of vertical fold-over is failure of the vertical oscillator output tube. Vertical output grid coupling capacitor being shorted or leaky can cause improper operation of the vertical output tube, causing vertical fold-over."

So maybe replace the grid cap and try some other vertical output tubes?

Dave