Originally designed not as a standalone mic preamp, but as a for the legendary Neve 8078 mixing console, the 1272 found second life as a powerhouse preamp and DI box. Today, re-creations and original vintage units are staples in studios worldwide.
A resistor from the output (secondary of the transformer or after Q6) feeds back to the emitter of Q2 (the differential pair). The gain switch selects different feedback resistors, changing the closed-loop gain. Neve 1272 Schematic