MR 66
McIntosh
AM - FM MONO/STEREO TUNER
The Compendium
FRONT PANEL: Anodized gold and black aluminum panel. AM tuning control. Illuminated
dial with separate bands for AM and FM. Illuminated signal strength meter.
Illuminated TUNING meter. FM tuning control.
7 AM function switch: MULTIPLEX FM,
AM OUT, NARROW, MEDIUM 1, MEDIUM 2 or BROAD. MODE SELECTOR switch: MONO AM, MONO
FM, STEREO or POWER OFF. AUTO FREQuency control: MIN to MAX.
FM FUNCTION switch:
MUTE OUT, MUTE IN or FM OUT. ZERO ADJUSTMENT for AM and FM signal strength meters
behind end caps.
BACK PANEL: MULTIPLEX OUT. FM MULTIPLEX adapter POWER. Screw terminals for external
AM ANTENNA.
AM ANTENNA switch: ANTENNA or LOOP.
LAMPS switch: HIgh or LOw.
Unswitched AC outlet. Power cord. FUSE. Screw terminals for 300 or 75 ohm FM
ANTenna. MPX INPUTS: 1 and 2. AM OUTPUT LEVEL. OUTPUTS: AM , FM, STEREO-MON JACKS 1
and 2. FM OUTPUT LEVEL.
FM SECTION: Sensitivity: 3-1/4uV. Response: 20-20kHz within 2dB. Distortion: less
Than 0.8%. Capture Ratio: 1 to 0.7. Three IF stages. Two limiters. Image
Rejection: 80dB.
AM SECTION: Sensitivity: 1.5Uv. Selectivity Bandwidth: 20-20kHz, 20-11.5kHz, 208kHz, and 20-6.5kHz. Whistle Filter Reject: 70dB at 10kHz. Audio Out: 4v.
TUBES: 2-6BN4A, 12AT7, 4-6AU6, 6CS6, 12AU7, 6BN8, 2-6U8, 2-6BA6, 6BE6,
2-6BY8, 6BW4.
OTHER: Mono/stereo. Stereo simulcast AM/FM tuner. Can be used for FM stereo with
outboard MA 6 multiplex adapter. Separate AM and FM tuning knobs.
Power Requirements: 105~125V at 75 Watts.
© 2007-2015
VintageMac – Larry Hodson
Rev. 114
Page 1 / 2
MR 66
McIntosh
AM - FM MONO/STEREO TUNER
The Compendium
MR 66 - Sold from June 1960 - 1962. S/N: 1N001~2N347 & 100G1~118G1 (1,353 UNITS)
Size: 5-1/8"H, 15-5/8"W and 12-3/16"D behind panel. Weight: 27 lb.
McIntosh MA 6 -
$325.00
Multiplex adapter for MR 66. External. 4-pin plug \ fits socket
on the back of MR 66.
TUBES: 6AU6, 12AU7.
MA 6 - Sold from February 1962 - January 1964. S/N: 100S1~179S6 (5,078 UNITS)
© 2007-2015
VintageMac – Larry Hodson
Rev. 114
Page 2 / 2