[jhalphen]

Hi to all,
Hi Ruru, Thanks! for the reply.

Precise model # and chassis # is precious data.

About the electrolytic cap you replaced, it's spot on. 7 microfarads higher has no importance. Electrolytics, historically, always had very wide % variations, often - (minus) 5/10% and + 20% tolerance.
I think you wired it in correctly as +/- polarity inversion usually results in a show display.
However, with the evolution of markings & brands, some have the + clearly identified, on others, a black line indicates minus (and no + marking). When replacing many or if tired, we all make mistakes sometimes, even the best of us.

V output tube "flash & bang" (once): could be a partially shorted/intermittent tube. Have a known good or new one to substitute?
Tubes are tough animals, but the TV is from the 60s and may have been watched thousands of hours.

Thread name change: you created the thread; go back to your first post and you should be able to edit the title.

Best Regards
jhalphen
Paris/France