The BA283 requires (not the 48V phantom power). It also needs a very clean supply. If you look at the original schematics, you’ll see extensive decoupling capacitors (100uF and 100nF) right at the module. Skipping these will result in a motorboating oscillation that will drive you crazy.
The "magic" of the 1272 schematic lies in its specific transformers and the interaction between its discrete transistors.
, a properly implemented 1272 module features the following specs: Specification ~39dB (Stock), up to 50dB+ with modifications Frequency Response +/- 0.5dB 20Hz - 20kHz Input Impedance 300 or 1200 ohms (selectable) Output Impedance Max Output Level +27.4 dBu @ 600Ω Power Requirement +24VDC @ 80mA The 1272 vs. 1073 Comparison The primary difference in their schematics is the number of gain stages Neve 1073: amplifier stages, allowing for up to
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