Electrolytic Capacitor Replacement?

[jhalphen]

Hi to all,
Hi Ruru,

Thanks! for the photos of the tube labels & entire chassis.
While waiting for Ron-L's possibly exact chassis data, i did some analysis.
- your chassis CT1905 has a Pwr Xformer, the CT2303 doesn't.
- yours: E series 6.3V parallel heaters, the other, series string (no Pwr Tx).

V oscillator and Output in yours is one tube, 6EM7, the other 13EM7
same tube ? different filament supply.

I've highlighted in red the V oscillator and V power amp sections (all in the same tube). Could yield some info such as tube pin voltages (& waveforms if you decide to try your Scope).

6EM7 tube data here, on our french site : shows pin functions & typical voltages in circuit (here V oscillator & output Amp).
https://www.doctsf.com/lampe-6em7/l3852

Tube pin IDs in last photo. Seen from UNDER, as always in tube data books

This is just analysis work in case Ron-L doesn't have the correct schematic.

Best Regards
jhalphen
Paris/France
PS : to edit thread to : Repair of Canadian RCA B&W TV chassis CT1905A 01. (tv model 19TC318B)
your have to go to the first post you created & edit it's main headline (should work!).

[ronl]

Hi Ruru. Sorry for the delay ( xmas,new years prep.)but I do have your service info.pls pm me an email to send scans to and ill scan when I can. RonL

[Ruru]

Originally Posted by ronl

Hi Ruru. Sorry for the delay ( xmas,new years prep.)but I do have your service info.pls pm me an email to send scans to and ill scan when I can. RonL

Hi Ron, You're a legend! Thanks so much for looking the info. I sent you a PM with my gmail details, I hope that's good enough? Happy Holidays! Or Merry Christmas!

[ronl]

Thanks Ruru. Info sent.Happy Holidays!!! RonL

[Ruru]

Hiya Folks. Happy New Years!

I was at my friend's workshop earlier and brought along the vertical osc vacuum tube (6EM7) And tested it on his tube tester. And... seems like it's bad to me? first time it went up to about 'weak' and then dwindled down. and second time it just dwindled down all the way..

https://youtube.com/shorts/MmMC-7H8JyU
Here's a video of what i mean.

Anyways. I'm gonna look around for a replacement tube to see if i can find one. I'm thinking maybe the capacitors weren't wrong but the tube was just on the verge... I'll obviously recheck my work.