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One 12AV6 is the audio driver stage and the other is a phase inverter for the PP output stage.
I found out why the radio was cutting in and out - a cracked 220 ohm carbon resistor in the pi filter network in the power supply. There was no hum; but, the filter capacitors tested a little on the leaky side on my Eico capacitor bridge. I'm also replacing the selenium rectifier.
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