1949 RCA Victor Black and White TV Model 9-T-240

[Lain94]

A bit of an update: I started cleaning the tv and vacuuming it out with not much trouble. It looks much better now and I also cleaned the tube sockets and gently wiped the dust off tubes so I can read them and see them better for testing.

What is surprising to me is the fuse is not blown! It appeared to be intact and I could not believe it so I tested it for continuity and sure enough it was still intact. So nothing horrible happened to it that caused it to be taken out of service. This is reassuring. Furthermore I then carried on tested tubes, only have the ones in the metal shield left which are a pain to get out without damaging.

So far only a few tubes are bad on emissions mostly 6SN7s of which this tv has 4. The 6SN7s do not have any shorts or leakage though. The only tube that was completely dead was the HV rectifier tube which is an oddball a 1B3. It uses a rather low voltage for its filament. I tested it and doubled checked my settings and connections. It had no emissions and was totally dead. I guess that is what put this tv out of service...

Hopefully this was not caused by a bad flyback or vice versa. I will test the flyback in the future when I have more time.

Still confused about the blue light in the back of the next of the CRT near the cathode. The filemant gloes fine as it should and CRT tester did not indicate any shorts at all. Also the blue light only appears in the neck when I am specifically testing the emissions with the dial turned to the emissions part of testing. Tapping the tube gently has no effect. Not sure if it is some weird type of short that the tester is not picking up on or what.

I have verified the settings I used for the crt tube tester were indeed correct and this crt tester has proven itself to be fairly accurate and reliable as i tested on multiple tvs recently with believable results.

https://imgur.com/a/tjEvn6Z