From the analysis of the phenomenon of failure, failure in the channel circuit in, first test week in TDA8305A20, 21-foot external T101 (synchronous detector) and add-ins in the week 13 foot T102 (audio frequency). Found in two weeks of enclosing the ceramic tube capacitor black go bad. Be removed and welded back in place the T101, T102, enclosing 51pF ceramic capacitors at the T101, T102 external 100pF ceramics capacitors, power adjust T101 cores make the best image, adjust T102 cores so that sound the best.