The entire unit gets stripped down to ground, power transformer, choke, VU meter, power switch, and turret board gets reused, the rest of the old electronics get gutted out and I build a custom preamp for you from ground up. About the pre amp and specs. Transformer Balanced input and outputs. 1:15 step up input transformer. That with combination of the gain stages handles any types of microphones specially ribbon microphones that are gain hungry.
Phase, -20db input pad, Low Cut can be added. Gain control (trim), attenuation (balanced variable 600Ohm attenuator). Balanced VU meter driver board will be driving the VU meter, my custom designed driver board will give you reference levels of +4db, and will not distort or load down the audio. If you have any questions drop me a line.The item "AKAI M7 M8 Roberts 770 990 Balanced Microphone Line DI Tube Preamp Conversion" is in sale since Monday, March 9, 2020. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "turquoiseutopia" and is located in Los Angeles, California. This item can be shipped to United States.