Free Resources for the Pro Audio Community AllADRAKGAltecAmpexAPIAudixCadacCalrecDan Alexander AudioDBXEMIEMTFairchildFocusriteHeliosLyrecMCIMidasMincomNeumannNeveOtariPultecPYERCASchoepsSiemensSonyStuderTelefunkenTeletronixTridentTweedUniversal Audio API 605, 610, and 620 Power Supplies Spec Sheet API Neumann NK 48A Power Supply Schematic Neumann Schoeps M910 Power Supply Schematic Schoeps Neumann NU67u Power Supply Schematic Neumann Schoeps N60EA Power Supply Schematic Schoeps EMT V54 Schematic EMT Schoeps N20B Power Supply Schematic Schoeps Schoeps N60B Power Supply Schematic Schoeps Amperex 6267 Tube Spec Sheet Neumann NN48 Power Supply Schematic Neumann Neumann NK48A Power Supply Schematic Neumann API 550A and 525C Module Wiring API API 440 Fader Brochure API API 8100 VU Meter Amp Brochure API API 705 Audio Power Amplifier Brochure API API 350 Brochure API API Model 325 Operating Instructions API API 325 Schematic API API 325 Amplifier Card Brochure API API 312 Mic Pre Schematic 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