The 1272 uses a 4-position rotary switch to set gain from +4 dB to +14 dB in roughly 3 dB steps. This is achieved by altering the negative feedback loop around the BA283.
Feedback and stability
The schematic revolves around three key components: Neve 1272 Schematic
Copyright© 2021 Smart Phone Flash Tool - smartphoneflashtool.com