The Bogen MXM-A is a professional broadcast quality, self-powered mixer preamplifier. Designed for use in theaters, radio stations, recording studios and public address applications. Produced in the United States by Bogen-Presto Corporation. The Output may be used to feed booster amplifiers or a low impedance 500/600 OHM transmission line by means of a 500/600 ohm plug-in transformer. There are seven available input signals of which each may be mixed and faded, ant the volume of each, except the bridging input/output, may be controlled individually or simultaneously with the master volume control. All five microphone channels are high-impedance but can be converted to low impedance by the use of plug-in transformers. One microphone input converts to an equalized input for a magnetic phono cartridge or tape playback head. The two auxiliary inputs, both high impedance, high level, are connected to a fader control. A bridging in put accepts signals from a remote preamplifier or a zero level line. Where additional inputs may be required, up to THREE MXM-A’s may be put in parallel to accommodate up to 21 inputs. The master gain control may be used to adjust the output level.
Condition: Working: Excellent
Cosmetic: Excellent, see pictures.
: At 20V into high impedance load at 1% distortion; at 4V into 600ohms (with plug-in transformer) at 1% distortion; at 0.1V into 1 meg ohm from bridging output. Frequency Response
: 18-38,000 cps. ±1db Output Impedance
: High impedance less than 3,0000 ohm; 500/600 ohm with TH600 (broadcast quality) plug-in transformer. Input Sensitivity
: High impedance 2 MV; Low impedance 0.1 MV; Mag/Tape 1 MV; Aux 0.1 V; Bridging 0.5 V. Hum
: (below rated output): Microphone -60db Tone Control Action
: Treble (10KC) +12 dB to -12 dB; Bass (50 cps) +14 dB to -18 dB Tubes
: SIX (6)
4- 12AX7, 1- 7247, 1- 12AU7, plus 3 silicon rectifiers Power Consumption
: 26 watts at 117 VAC, 50/60 cps.
: 16 ½” wide, 12” deep, 4 ¾” High