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21zp4a crt sub

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#11

03-30-2025, 02:37 PM

bandersen

RCA 741PCS

Join Date: Mar 2009

Location: Chicago, IL

Posts: 8,778

Adjustingthe horizontal freq. & drive, use fresh tubes, recap etc. Make sure B+ is where it should be.

The focus voltage is probably derived from the boost voltage which comes from the flyback damper circuit. So, if you have low HV, the boost * focus voltage are probably low.

You really need a schematic. What model # is it?

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