Its a YM chassis.
Typical mid 70's modular set. Delta jug, Zenith type power supply
with transformer & oil cap. Easy to deal with, no killer circuit
designs.
Try the circuit breaker first. If it popped you lose HV but still get
audio.
If its beyond that what is your experience level & what do you have for test equipment ???
Also a pix of the chassis helps others to relate to the set.
73 Zeno
LFOD !