The selenium rectifier is mounted to the rear of the chassis on the outside...it has about 6 square, stacked plates about an inch square. If it uses a silicon diode, you will see a small silicon diode (small, black cylinder with band on cathode end) mounted on a terminal strip on the outside of the chassis.
I have never had a selenium short out when the set was off. Haven't had one short out by itself at any time, but have noticed excessive voltage drop (resistance).
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