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that is look like you have a bad soldering in the main power circuit and higvoltage circuit HORIZONTAL OUT PUT TRANSISTOR ?/use a magnifier to check for cracked solder you probly find some one...
hope that help
if the jack out side works okay, that indicates that the pre amp is fine. the sound on the pre amp is tapped before the main amplifier.
check the main amplifier ic in side if it is getting hot.
you need to charge that ic.
The solder joints on the CRT board might have cracked and cause this symptom. What you are describing indicates that the red gun is intermitten, and the solder joints on the CRT socket itself (red cathode) or the red output transistor have probably cracked loose.
ok, the problem you may be having is bad solder connections on the vertical deflection IC. resolder them or have a tech do it. also check for bad solder on the 9 volt regulater IC as well. these problems are common to older sony sets.
do you have a dvd or vcr hooked up to this? Is it hooked up with the a/v cables (yellow, red and white). double check the cable hookup make sure audio cord is not in the video jack, from what you are saying this will do that if it is. Also there is a capacitor on the main board believe it to be C3412 which intermittenly gives horz. lines but haven't had a audio tone with that.
The Sony sets are full of circuits which monitor and detect faults throughout the set. These circuits monitor main B+ voltage and current, low B+ voltage and current, vertical and horizontal circuits and CRT current. Finding an intermitten problem in these circuits is no easy task and should be left to someone with experience in Sony sets.