MXR is very well known for their Guitar effects pedals. MXR System Preamp II M-150 (Ultra Rare) From 1980. Designed For Musicians And DJ’s. It has 2 Phono inputs which allows you to use its mixer function to fade from one vinyl record to another like a DJ. It allows you to route two simultaneous signal sources independently to a monitor channel, tape output or power amp and speakers. A mix control blends the two signals and permits fading from one source to another. Great for creating mix tapes or CD’s. A versatile instrument input enables electronic instruments and mics to be amplified and blended with program material. You can also insert external processors. It has a separate monitor select switch for the headphone output. It can choose A, B, mix or either tape, just like the select for the main channel. The main channel can be playing Phono-1 while you are cueing up Phono-2 on B, using the headphones. This feature allows you to create mixes in real time. Other unique features are front panel Guitar/Keyboard/Mic input and the two send/receive loops. The loops let you insert an external processor in the audio path. You can choose where in the path you want it. One can be in A or Main, while the other can be in B or Mix. It has support for two tape decks. Comes with Operation Manual, Schematics and Reviews. In very good condition and everything works but because it is over 40 years old and the nature of vintage electronics I’m selling this as is for restoration with no returns. Specifications Max input level Phono 1,2 greater than 120 mv peak ( 1 kHz) greater than 1 volt peak ( 20 kHz) Line +16.9 dbv ( 7 volts rms) ( 20 Hz- 20 kHz) Max Output Level +16.9 dbv ( 7 volts rms) ( 20 Hz- 20 kHz) Input Impedance Phono 1,2 47k ohms Line 100k ohms Output Impedance Main approx. 600 ohms Monitor approx. 600 ohms Headphone Output 150mw into 200 ohms Residual Noise Phono 1,2 better than 88db below 10 mv input ( A weighted) Line better than 90db below 1 volt input (20Hz- 20kHz) T.H.D. Less than .005% at 0 dbv (20Hz- 20kHz) Any input to output I.M. Less than .005% at 0 dbv (60 Hz/7 kHz, 4:1) Freq. Response Phono 1 20Hz-20kHz +/- 0.25 db at 0 dbv 3 db down at 5Hz and 80 kHz Phono 2 30Hz-20kHz +/- 0.25 db at 0 dbv 3 db down at 20Hz and 80kHz Line 10Hz-40kHz +/- 0.25 db at 0 dbv 3 db down at 10Hz and 100kHz Subsonic Filter Response Phono 1 -1db at 23Hz -3db at 19Hz. -29db at 5Hz Gain Phono 1,2 40 db (1kHz) Line 0db/20 db max. (selectable) Instrument 0db-30db (via front panel control) Channel Seperation better than 60db ( any input)

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