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!).