EQ components were removed and unit adjusted for maximum performance.Microphone InputMic #2: input -- I have used only mic #2, but not the others which I suppose works alsoMonitor Rec: outputVolume controlled by Master and Mic #2Line InputRep In (with XLR female to female pigtail): inputRep Out: outputVolume controlled by PlaybackHere are the details of the service done by Mr. Eich:Power supply:Custom built into a metal chassis. Provides filament and B+ power for one preamp unit. Designed for adequate current headroom and rated for continuous duty service. With line fuse, power switch, status LEDs, output connector and power cord.Setup and repair of mixer/preamp unit, including cleaning of cabinet, face plate & knobs, replacement of all electrolytic capacitors, replacement of any additional defective components, test all tubes, clean switches and controls, complete test of all functions..