Help needed on Admiral 21D1 chassis tv

[bandersen]

I restored an Admiral set recently that also had good HV when I measured it at the CRT anode, but had a dim picture. Eventually, I tracked the problem down to a 470K resistor in series with the HV lead that had gone bad. I got erratic values when I tried to measure it. It probably had carbon tracks burned through it. Once replaced, I had a nice bright picture.

That resistor is mounted on the 1B3 rectifier tube base as I recall.
Good luck.