Help needed with a "19 Zenith 9-291 chassis (SB1923W Space Command set, 1985 build)

[zeno]

Very few of these came back for service. Check the STR first.
Marking tells the voltage out so an SRT30130 is 130V
STR30125 is 125V etc. One of the big bricks usually will
have raw B+ & other end regulated B+.
If the regulator is OK its a hoz problem or normal overscan.
STR's loved to short but almost always cause shut down
& or hum bars.

73 Zeno