Vintage Shure M63 Audio Master - EQ - 1970s

Item Description: This is a true USA made vintage Shure equalizer. I am the second one of the unit. it was purchased from a church who kept it rack ready for reel to reel recording in the 1970s. Full functional with no issues. Very rare.

Item Specs from Manual:

The Shure Model M63 AUDIO MASTER@is designed

to give maximum flexibility in the control of volume, bass response, treble response, and high and low frequency rolloff. The Model M63 works ideally as a Master Control Center when used in conjunction with the Shure Model M68 series of microphone mixers.

The M63 provides a means to equalize sound sys- tems for correction of room acoustics, to reduce feedback, to provide special sound effects, to reduce stand and stage noise and for tape recording.

AUDIO MASTER features: m Five types of outputs

Distortion

Under 1% THD at +8 dBm output

Clipping Level

+18 dBm (600-ohm load)

VU Meter (Calibrated for 600-ohm line termination) 0 VU = +8 dBm tl dB fixed; or

0 VU = +4 dBm; output may be attenuated by

20 dB

Inputs

Two, mixing. Impedance 50k nominal. No amplifica-

tion precedes VOLUME control, so that high-level input signals cannot cause overloading.

Outputs

600-ohm line: Balanced and floating, 150 ohms

minimum load, 125 ohms actual internal imped- ance. Will operate with up to 100 mA dc through transformer for driving telephone lines.

Auxiliary Hi-Imp.: Unbalanced, 4.7k internal imped- ance. For driving high-level, high impedance inputs.

Microphone Hi-Imp.: Unbalanced, Ik internal imped- ance. For driving medium-level high impedance microphone inputs.

Microphone Lo-Imp.: Balanced, 0.5-ohm internal impedance. For driving low-level 25- to 250-ohm microphone inputs.

Headphone: Two-level, for 600- to 2,000-ohm head- phones. Crystal headphones may be used.

-600

-High

-High

-Low

-Headphone jack for monitoring

ohms balanced line level impedance, high level impedance, microphone level

impedance, microphone level, balanced

= Inputs for two driving sources

= VU meter to monitor audio level

= Continuously variable high-pass and low-pass

6 dB per octave filters

Bass and treble tone controls

SPECIFICATIONS

(At 120 volts ac, 60 Hz line voltage)

Frequency Response

- t 2 dB, 20 to 20,000 Hz (all controls

flat)

Voltage Gain (outputs terminated as noted, others open; volume and level control max.)

Line Output: 38.5 dB (600-ohm load)

Aux. Output: 39.0 dB (47k load)

Hi-Imp. Mic. Output: -1.0 dB (33k load) Lo-Imp. Mic. Output: -21.0 dB (150-ohm load)

Tone Controls

Bass: +14, - 19 dB at 100 Hz Typical Treble: +16, - 19 dB at 10k Hz Typical

Filters

Hi-Cut and Lo-Cut 6 dB per octave, continuously variable - 3 dB point

Noise Output (Line with 600-ohm load) Volume Control min.:

76 dB below +8 dBm, 20 Hz -20 kHz

81 dB below +8 dBm, 300 Hz -20 kHz Volume Control max., 4.7k source:

68 dB below +8 dBm, 20 Hz -20 kHz 71 dB below + 8 dBm, 300 Hz - 20 kHz