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The failure rate of those output transistors was on a par with OZ4s and vibrators in the older all-tube radios. There was always a fractional-ohm resistor/fuse in the emitter leg of the transistor. It popped whenever the transistor shorted. We had to keep a running stock of those (something like .27, .33, .47 ohm IIRC). Don't recall ever having to replace one of the space-charge tubes, though.
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