Help needed with a "19 Zenith 9-291 chassis (SB1923W Space Command set, 1985 build)

[rca2000]

I am NOT sure about your readings...AND I see one power resistor that does NOT look too good, next to that large power resistor. . I seem to recall a lot of sets using series-pass regulators, often had a low-value resistor off of the regulator output, that OPENED..and when it DID...that big resistor then carries all of the load...and the B+ is low and not steady.. If you raise your b rightness level...see if your B+ stays constant. if NOT..you are NOT regulating properly...