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Hi again Marco,
Sorry to hijack this thread, I know quite well the RV109 chassis, as I restored more than a few of these, the 21" CRT variant to boot! Be wary of the awful paper capacitors and sometimes mica ones could cause problems in the horizontal section. Another weak point of this chassis is the cup holding the 1B3 socket, it tends to accumulate lots of dust and dirt, helping the EHT discharge with a loud snap.
About the similarities of the flyback used on your Westinghouse, I was referring to the older Marelli, like the RV90, RV94 and similar Tv sets
Cheers
Giulio
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