McIntosh MR73

The McIntosh MR 73 is a highly sensitive solid state AM/FM tuner.  
My Dad was the sole owner and it has been kept in storage since he last used it in 1991.  

When introduced in ~1968, it demonstrated many circuit advances developed by the McIntosh laboratory including the use of phase linear crystal shaped IF amplifiers, special multiplex detecting circuits that eliminate critical adjustments, ultrasonic muting for complete silence when tuning stations, and a visual indicator of correct antenna direction for minimum multipath distortion. The MR 73 also introduced a new computer designed filter to reduce noise from stations broadcasting subcarrier auxiliary services.   
Specifications of the MR 73 when introduced are copied below:   FM Section  Frequency: 88 to 108 MHz; Useable Sensitivity:  2,5 microvolts at 100% modulation (±75 kHz deviation) for less than 3% total noise and harmonic distortion.
Audio Frequency Response:  Flat from 20 Hz to 20 kHz with standard de-emphasis and 19 kHz pilot filter. Harmonic Distortion:  Mono : Less than 0,3% at 100% modulation ±75 kHz deviation. Stereo : les than 0,7% Capture Ratio:  Better than 1,5% dB at 100% modulation Muting:  AF injected ultrasonic muting at least 60 dB noise reduction between stations Oscillator Drift:  less than 25 kHz Image Rejection:  Better than 80 dB at 90 MHz;  better than 70 dB at 100 MHz Hum: better than 70 dB below 100% modulation Output:  Approx. 2,5 volts, low impedance FM Antenna Inputs:  Built-in loopstick or external antenna switch selected IF:  two Ics and two phase linear crystan filters Radiation: Substantially below FCC requirements Stereo Separtion:  Better than 35 dB at 1 kHz Stereo Filter: Greater than 48 dB suppression of 38 kHz multiplex carrier Stereo Indicator:  Front panel multiplex stereo light activated by 19 kHz carrier-only SCA Filter:  50 dB down at 67 kHz to 74 kHz , 275 dB per octave slope Automatic Mono/Stereo Switch:  McIntosh developed; all electronic automatic mono/stereo switching circuit Semiconductor Complement:  22 diode, 24 Transistors, 2 Integrated Circuits, 1 Indicator Tube   
AM Section Frequency:  55 to 160 kHz  Sensitivity: Better than 12 microvolts at 1000 kHz (using the external antenna input) Frequency Response:  Down 6 dB at 5 kHz Harmonic Distortion:  less than 1% at 39 % modulation Selectivity:  -3 dB at 10 kHz Image Rejection:   60 dB or greater at 1000 kHz Signal-to-noise Ratio Better than 55 dB    
General Power Consumption:  20 watts, 105 to 125 volts, 50 to 60 Hz Dimensions Front Panel : 16 inches wide by 5-7/16inches high Chassis : 15 inches wide by 13 inches deep, including PANLOC shelf and back panel connectors Knob Clearance : 1-½ inches in front of mouting panel Weight:  24 pounds net, 36 pounds in shipping carton Finish:  Front panel. Anodized gold and black with special gold/teal panel nomenclature illumination. Chassis:  Chrome and black