Hi to all,
an attempt : entering RCA chassis # CT1905 into a Google search lands on this ETF document, a RCC Canadian TV chassis database & schematics.
The 10 page (3.9Mb) document shows schematics used in chassis CT1905 & CT2303.
@Ruru : does this bear any ressemblance to your TV ?
https://earlytelevision.org/pdf/rca_ct2303_canadian.pdf
Best Regards
jhalphen
Paris/France