Sony TV-770 dim CRT.Sound OK.

[centralradio]

Hi to all Videokarma.

I have Sony TV-770 here which has a dim CRT"Low brightness" .Sound OK .I'm questioning if the CRT could be bad.Hard to see if filament is lit....Also notice the pix cathode voltage is around 25 volts at full brightness which supposed too be 37 volts..B+ 12 volts is good...

Photo of set and Schema available at:

https://www.radiomuseum.org/r/sony_t...er_tv_770.html

Has anybody worked on this kind of set....

Thanks in advance.