I went to Guitar Center and tried out the PCB based Princeton Reverb on the floor. Fender changed the reverb return circuit quite a bit in the PCB versions (the foot switch grounds the reverb after the triode instead of before, and the peak amount of reverb is dramatically less). It was not quite worst case Guitar Center noisy, but for similar amounts of reverb I heard similar amounts of 60 Hz hum.
Case closed.
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