Raytheon/Sonotone flyback

[Gus1969]

Originally Posted by zeno

Must be a kit sets. looks US built but I do not recognize the
chassis or part numbers ( on PCB). So must be based on one of the
very small builders.
Often we saw tires melted away but the FBT works. Most bad FBT's
had shorted turns. Best start is be sure the H out tube has a HIGH
negative voltage on G-1 & cathode current within spec. Take it from there.
BTW RCA, GE & Sylvania used to publish "tube manuals".
https://www.ebay.com/itm/32572606269...Bk9SR9LN-azcYg

They are quite helpful and cover a LOT of things.

73 Zeno
LFOD !

Hi Zeno, good advices. Honestly, first time I saw to measure cathode current
was reading Videokarma restorations! After recap, it will have a "soft start".
Maybe, for work comitmments, can't work on it for some days.
Curious this set was not made for a main manufacturer. A colleague (the guy of the Hitachi I asked previously), send me via whatsapp some captures of a very similar schematic diagram. Thank you so much.