Hi Dan: This is (yet another) Gibson GA8T - guessing - the last of the 'Gibsonette' series. I confused this model for the one you were/are spying on. This is the 2X6BM8 push/pull model mentioned above; single 12AX7 preamp, and 5Y3 rectifier. On eBay, auction link Here Has foot-switched tremolo operated by the 'front' half of one of the 6BM8s, the other 'front' functioning as the phase inverter/driver.
Not the best pic but in very original condition - the tan thing (power supply resistor) on the far right just above the rectifier in same condition as mine; ready to crumble. The 'brown foot pedal' mentioned in the auction text is actually a solid mahogany block drilled out for the switch; the 'web-lore' is that these wood switch blocks were the 'waste' from the cutting the cutaway out of LP bodies and they refinish to perfection.
Not the best pic but in very original condition - the tan thing (power supply resistor) on the far right just above the rectifier in same condition as mine; ready to crumble. The 'brown foot pedal' mentioned in the auction text is actually a solid mahogany block drilled out for the switch; the 'web-lore' is that these wood switch blocks were the 'waste' from the cutting the cutaway out of LP bodies and they refinish to perfection.