Ctc 16ex sos

[bluenorm]

Hi friends
Ctc16 xe was working fine with stable and bright picture, and decent colors. Last time it trip the circuit breaker. There was no smoke nor burning odors. I removed the back cover reset the breaker and it trip the breaker again. The thermister was arcing badly. The B+ circuit was out so was the 6volts for the tubes. Nothing, no juice in the set. second attempt was to disable flyback but it trip again.

During visual inspection there was nothing burn under the chassis. Power diodes checked OK

My rational points to the main transformer, because the lack of 6 volts that is independent of the B+.(thermister) set is not use on regular basis.

open to any suggestion that could help me out