McIntosh Tuners

McIntosh Tuners
A History

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		For complete literature and retail prices of current products Contact McIntosh Laboratory, Inc.
T = tube		A complete list of tubes is given for tube tuners.
sao = stereo add-on		There may be missing prices or other features. Tuners and multiplex adapters are listed numerically.
sc = am/fm simulcast		Any additions, corrections or comments are welcome.
sw = switch Adj = adjust ctrl = control		Scope outputs in early tuners may be named TP1 and TP2. They may be located on the main chassis instead of the back panel

MA5 T mpx

MA6 T mpx

MR55 T am fm mono

MR55A T am fm mono

MR65 T fm mono

MR65A T fm mono sao

MR65B T fm stereo

MR66 T am fm sao sc

MR67 T fm stereo

MR71 T fm stereo

MR73 am fm stereo

MR74 am fm stereo

MR75 am fm stereo

MR77 fm stereo

MR78 fm stereo

MR80 fm stereo

MR500 fm stereo

MR510 fm stereo

MR7082 am fm stereo

MR7083 am fm stereo

MR7084 am fm stereo

MA 5 multiplex adapter for mounting internally in the MR65 and MR65A tuners.

ELECTRICAL: Hum -60dB. Distortion 0.3%. Supression of pilot and carrier -40dB

MECHANICAL: Mounts with 4 screws supplied. 9-pin plug for internal connection to main chassis.

TUBES: 12AU7, 6U8

Size 3-13/16"H, 4-1/8"W, and 3-7/8"D. Weight 3/4 lb.

MA 6 Multiplex adapter for MR66. External. 4-pin plug fits socket on the back of MR66

Tubes: 6AU6, 12AU7.

MR 55 Tube. AM-FM Mono.

FM SECTION: Sensitivity 3uV. Response 20-20kHz (+3 -3dB). Distortion less than 3%. Capture ratio 1 to 0.8. Four IF stages. Two limiters.

AM SECTION: Sensitivity 1.5uV. Selectivity bandwidth 20-10kHz, 20-6.5kHz, and 20-2kHz. Whistle filter 70dB reject at 10kHz.

FRONT PANEL: Selector sw: fm listen, fm tune, am brd, am med, am sharp or phono. Volume control with on-off switch. AM sensitivity sw: greatest, intermediate or minimum. AFC ctrl: min to max. Tuning ctrl.

BACK PANEL: MPX out. Audio out. Phono in. Panel lamp sw: high or low. AM antenna sw: loop or antenna. Ext am antenna. 300 or 75 ohm fm antenna.

TUBES: 2-6BZ7, 6AB4, 2-6BJ6, 3-6AU6, 4-6AL5, 6BN6, 6BV8, 6BA6, 6BE6, 2-12AU7.

Size 4-3/4"H, 14-3/4"W and 12"D. Weight 17 lbs-3 oz. Sold from 1957-1959. Last retail price $249.00

MR 55A Tube. AM-FM Mono.

FM SECTION: Sensitivity 3uV. Response 20-20kHz within 3dB. Distortion less than 3%. Capture ratio 1 to 0.8. Four IF stages. Two limiters.

AM SECTION: Sensitivity 1.5uV. Selectivity bandwidth 20-9kHz, 20-6.5kHz, and 20-2kHz. Whistle filter 70dB reject at 10kHz.

FRONT PANEL: AFC ctrl: min to max. Input selector sw: phono, am sharp, am med, am brd, fm tune or fm listen. Tuning ctrl. Volume with on-off switch.

BACK PANEL: AM antenna sw: ant or loop. Ext am antenna. 300 or 75 ohm fm antenna. 2 audio out jacks.

TUBES: 6BK7, 2-6AB4, 2-6BA6, 4-6AU6, 6AL5, 2-6BN8, 6U8, 12AU7, 6BE6, 6BW4.

Size 4-3/4"H, 14-3/4"W and 12"D. Weight 17 lbs-3 oz. Sold from 1959-1962. Last retail price $276.00

MR 65 Tube. Mono.

ELECTRICAL: Sensitivity 3.25uV. Response 20-20kHz within 2dB. Distortion less than 3%. Capture ratio 1 to 0.7. Image rejection better than 80dB. Hum -65dB. Audio output 4V. Three IF stages. Two limiters. Antenna inputs 300 ohms balanced and 75 ohms unbalanced. Can be used for stereo with the addition of an MA5 multiplex adapter that mounts internally. There's no MPX light feature when the MA5 is added.

FRONT PANEL: Volume ctrl. Mode selector sw: ext stereo, mpx stereo, fm, power off. AFC ctrl: min to max, Muting sw: in or out. Tuning ctrl. Zero adj for signal strength and tuning meters behind end caps. Signal strength meter. Tuning meter.

BACK PANEL: MPX output. Muting adj. Mono out (2). Stereo in and out. FM ant and to tv set terminals. Fuse. AC outlet. Lamp switch: high and low.

TUBES: 2-6BN4A, 12AT7, 4-6AU6, 6CS6, 6BN8, 6U8, 6C4, EZ80/6V4.

Size 5-1/8"H, 15-5/8"W and 12-3/16"D behind panel. Weight 21.5 lb. Sold from 1960-1962. Last retail price $225.00

MR 65A Tube. Mono/stereo. Can be used for stereo with the addition of an MA5 multiplex adapter that mounts internally. There's no MPX light feature when the MA5 is added. Sold from 1962-1966. Last retail price $284.00

MR 65B Tube. FM tuner Stereo.

ELECTRICAL: Sensitivity 2.5uV. Response 20-20kHz within 0.5dB. Distortion less than 0.5%. Capture ratio 1.5dB. Image rejection better than 80dB. Three IF stages. Two limiters. Factory built with MX-1 multiplex adapter installed. The MX-1 is the same as the MA5 but was supplied only with the MR65B

BACK PANEL: Panel light sw: bright or dim. Muting adj. Output adj. Ext stereo input. 300 or 75 ohm fm antenna. Audio out 2.5V fixed or variable. Scope outputs.

TUBES: 6DS4, 12AT7, 4-6AU6, 6CS6, 6BN8, 2-6BL8, 6BN4, 12AU7, 6U8, 12AU7. Solid state rectifier.

Size 5-1/8"H, 15-5/8"W and 12-3/16"D behind panel. Weight 22 lb. Sold from 1962-1964. Last retail price $329.00

MR 66 Tube. Mono/stereo.

Stereo simulcast (binaural) am/fm tuner. Can be used for fm stereo with outboard MA6 multiplex adapter. Separate AM and FM tuning knobs.

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, 20-8kHz, and 20-6.5kHz. Whistle filter reject 70dB at 10kHz. Audio out 4v.

FRONT PANEL: AM sw: multiplex fm, am out, narrow, medium 1, medium 2 or broad. Mode selector sw: mon am, mon fm, stereo or power off. AFC ctrl: min to max. FM function sw: mute out, mute in or fm out. AM signal strength meter. FM tuning meter. Zero adj for am and fm signal strength meters behind end caps.

BACK PANEL: MPX out. MPX adapter power. 2 mpx inputs. AM out. FM out. AM antenna sw: ant or loop. Lamp sw: hi or lo. AM out adj. FM out adj. Ext am antenna. 300 or 75 ohm fm antenna.

TUBES: 2-6BN4A, 12AT7, 4-6AU6, 6CS6, 12AU7, 6BN8, 2-6U8, 2-6BA6, 6BE6, 2-6BY8, 6BW4.

Size 5-1/8"H, 15-5/8"W and 12-3/16"D behind panel. Weight 27 lb. Sold from 1960-1961. Last retail price $325.00

MR 67 Tube FM tuner. Stereo. Glass panel at top. Anodized gold at bottom.

ELECTRICAL: Sensitivity 2.5uV. Response 20-20kHz within 0.5dB. Distortion less than 0.5%. Capture ratio 1.7dB. Image rejection better than 60dB. Four IF stages. Two limiters. Separation 30dB.

TOP PANEL: Pilot lamp intensity: bright or dim. Indicator function: signal strength or multipath.

FRONT PANEL: Glass panel top. Gold anodized bottom. Volume ctrl. Mode selector sw: mpx stereo or fm mono. Power sw: on or off. Muting sw: on or off. Tuning ctrl. Electron ray tube: signal strength/multipath and tuning . MPX indicator.

BACK PANEL: Muting adj. Audio out: 2.5V variable, 2.5V fixed. 300 or 75 ohm fm antenna. Scope outputs. Panloc mounting.

TUBES: 6DS4, 12AT7, 6AB4, 3-6AU6, 6CS6, 6AV6, EMM801, 2-6BL8, 6U8, 12AU7. Solid state rectifier.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 24-1/2 lb. .Sold from 1963-1968. Last retail price $299.00

Letter to all McIntosh dealers dated October 25, 1963.

"Technical additions to the MR71 tuner over the MR65B

1. The MR71 will be on Panloc mounting system. The MR65B was not.
2. The MR71 will have the multipath indicator as is now in the MR67. The MR65B does not have this.
3. The MR71 has an improved front end, which will completely eliminate the spurious frequency problem.
4. The MR71 has an SCA filter, which gives you 250dB per octave attenuation* of the annoying noises that leak into the stereo channel from storecasting.
5. The MR71 will have automatic electronic switching between mono and stereo and between stereo and mono.
6. MR71 has 5 IF stages. MR65B has four.
7. MR71 has two greatly improved meters, one in signal strength and one in center channel tuning.

When you stop to figure that the MR65B sold for $329.00 without these features, and the MR71 is priced at $399.00 -- this, in my book, makes it a terrific buy."

*Note: The dealer letter should say a filter with a 275 dB per octave rolloff.

MR 71 Tube. FM Stereo.

ELECTRICAL: Sensitivity 2.5uV. Response 20-20kHz within 0.5dB. Distortion less than 0.5%. Capture ratio 1.5dB. Image rejection better than 70dB. Five IF stages. Two limiters. Separation 30dB. SCA rejection 50dB.

FRONT PANEL: Glass panel at top. Anodized gold at bottom. Volume ctrl. Mode selector sw: stereo auto, mono or power off. AFC ctrl: min to max, Muting sw: in or out. Tuning ctrl. Signal strength and tuning meters. MPX and multipath indicators.

BACK PANEL: Muting adj. Audio out: 2.5V variable and 2.5V (rear ctrl). 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

TUBES: 6DS4, 12AT7, 6BN4A, 4-6AU6, 6CS6, 6HU6/EM87, 6BN8, 2-6BL8, 6U8, 12AU7. Solid state rectifier.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 27 lb. Sold from 1963-1969. Last retail price $399.00

MR 73 AM-FM tuner. Glass front panel.

FM SECTION: Sensitivity 2.5uV. Response 20-20kHz (+1 -1dB). Distortion 0.7% in stereo. Capture ratio 1.5dB. Image rejection 70dB. S/N 70dB. Separation 35dB@1kHz. Spurious rejection 90dB. SCA rejection 50dB.

AM SECTION: Sensitivity 12uV. Response -6dB at 5kHz. Distortion 1.0%. Adjacent channel selectivity 30dB. S/N 55dB. Image rejection 60dB.

FRONT PANEL: Mode selector sw: am, fm or fm mono. Stereo filter sw: out or in. FM muting sw: out or in. Volume with on-off switch. Tuning ctrl. Signal strength and tuning meters. MPX indicator. Multipath indicator.

BACK PANEL: Audio out 2.5V variable and fixed. Built-in ferrite loopstick. AM ant sw: ext or loop. Ext am antenna. 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 24 lb. Sold from 1969-1971. Last retail price $549.00

MR 74 AM-FM tuner.

FM SECTION: Sensitivity 2.5uV. Response 20-15kHz (+1 -1dB) stereo. Distortion 0.5% in stereo. Capture ratio 1.5dB. Selectivity: adjacent channel = 6dB normal, 15dB narrow. alternate channel = 68dB normal, 88dB narrow. Image rejection 95dB. S/N 70dB. Separation 35dB@1kHz. Spurious rejection 90dB. SCA rejection 50dB. Stereo filter noise reduction: 10dB position 1, 20dB position 2

AM SECTION: Sensitivity 75uV. Response: Normal -6dB at 3.5kHz, Narrow -6dB at2.1kHz. Distortion 1.0%. Adjacent channel selectivity: normal 35dB, narrow 45dB. S/N 55dB. Image rejection 65dB.

FRONT PANEL: Glass front panel. Mode selector sw: am, fm or fm mono. Stereo filter sw: out, 1 or 2. Selectivity sw: normal or narrow. FM muting sw: out, distant or local. Volume with on-off switch. Tuning ctrl. Signal strength and tuning meters. MPX indicator. Multipath indicator.

BACK PANEL: Audio out 2.5V variable and fixed. Built-in ferrite loopstick. AM ant sw: ext or loop. Ext am antenna. 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 25 lb. Sold from 1972-1979. Last retail price $849.00

MR 75 AM-FM tuner.

FM SECTION: Sensitivity 11.2dBF or 2uV. Stereo 50dB quieting sensitivity 39dBF or 50uV. Response 20-15kHz (+0 -1dB). Distortion 0.38% in stereo. Capture ratio 1.8dB. Image rejection 100dB. S/N 70dB. Alt channel selectivity 75dB. Separation 45dB@1kHz. Spurious rejection 100dB. SCA rejection 60dB.

AM SECTION: Sensitivity 75uV. Response 20-3.5kHz (+0 -6dB). Distortion 0.8%. Adjacent channel selectivity 30dB. S/N 45dB. Image rejection 65dB.

FRONT PANEL: Glass front panel with black & gold escutcheon. Selector sw: am or fm. Mode sw: stereo or mono. Mute sw: on or off. Volume with on-off switch. Tuning ctrl. LED column signal/tuning.

REAR PANEL: Audio out 2.5V variable and 1V fixed. FM Preselector sw: in or out. Built-in ferrite loopstick. Ext am antenna. 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 23 lb. Sold from 1980-1985. Last retail price $1349.00

MR 77 FM tuner.

ELECTRICAL: Sensitivity 2uV for 35dB of quieting. Response 20-15kHz (+1 -1dB). Distortion 0.2% in stereo. Capture ratio .25 dB detector only, 2.5dB complete tuner. Image rejection: 100dB at 90 MHz, 90 dB at 105 MHz IHF. S/N 75dB. Separation 40dB@1kHz. Spurious rejection 100dB. Selectivity: adjacent channel 6 dB IHF, carrier 47 dB down, alternate channel 50 dB IHF, carrier 90 dB down. SCA rejection 50dB 275 dB per octave slope.

FRONT PANEL: Glass front panel. Mode selector sw: mono, auto or stereo. Stereo filter sw: out, 1 or 2. Muting sw: out, distant or local. Volume with on-off switch. Tuning ctrl. Signal strength and tuning meters. MPX indicator. Multipath indicator.

BACK PANEL: Audio out 2.5V variable and 1V fixed. 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 27 lb. Sold from 1970-1978. Last retail price $699.00

MR 78 FM tuner.

ELECTRICAL: Sensitivity 2uV for 35dB of quieting. Response 20-15kHz (+1 -1dB) stereo. Distortion 0.2% in stereo. Capture ratio 2.5dB. Selectivity: adjacent channel = 7dB normal, 22dB narrow and 55dB super narrow. alternate channel = 55dB normal, >90dB narrow and >>90dB super narrow. Image rejection 100dB. S/N 75dB. Separation stereo 40dB@1kHz. Stereo filter noise reduction 10dB position 1, 20dB position 2. Spurious rejection 100dB. SCA rejection 50dB. Maximum signal input 12V across 300 ohms. Hum -70dB. Audio output 2.5V with front panel control. Audio output fixed 2.5V.

FRONT PANEL: Glass front panel with black & gold escutcheon. Selectivity sw: normal, narrow or super narrow. Meter sw: signal strength or multipath. Filter sw: out, 1 or 2. Muting sw: out, distant or local. Mode sw: stereo only, mono or stereo auto. Volume with on-off switch. Tuning ctrl. Signal strength and tuning meters.

BACK PANEL: Audio out 2.5V variable and 2.5V fixed. 300 or 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D behind panel. Weight 27 lb. Sold from 1972-1979. Last retail price $1699.00

MR 80 FM tuner.

ELECTRICAL: Sensitivity 9.3dBF or 1.6uV for 30dB of quieting. Stereo 50dB quieting sensitivity 14.7dBF or 2.5uV for 3% noise and distortion. Response 20-15kHz (+1 -1dB). Distortion 0.2% in stereo. Capture ratio 1.5. Image rejection 90dB. S/N 75dB. Alt channel selectivity 90dB (narrow) and 110dB (super narrow). Adjacent channel selectivity 8dB (narrow) and 60dB (super narrow). Separation 50dB@1kHz. Spurious rejection 110dB. SCA rejection 60dB.

TOP PANEL: 4 station presets, Preselect sw: in or out, Input sw: cable or antennae, Lock sw: off or on, De-emphasis sw: 75us, 50us, 25us, or out. Signal strength adj.

FRONT PANEL: Glass front panel with black & gold escutcheon. Selectivity sw: narrow or super narrow. Filter sw: out, auto or in. Mode sw: stereo or mono. Scan ctrl: slow to fast. Muting ctrl: min to max. Volume with on-off switch. Tuning ctrl. Push Buttons: 4 presets, Auto scan up and Auto scan down. Tuning. LED column signal strength. Digital frequency readout. Headphone jack.

BACK PANEL: Audio outputs: 2.5V variable and 1V fixed. Remote control push button jack. Remote control stations sw: preset or all. 300 or two 75 ohm fm cable inputs. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16"W and 13"D from front panel.. Weight 28 lb. Sold from 1980-1985. Last retail price $2499.00

MR 500 FM tuner.

ELECTRICAL: Sensitivity 13dBF or 1.25uV across 75 ohms. Stereo 50dB quieting sensitivity 37.3dBF or 20uV across 75 ohms. Response 20-15kHz (+1 -1dB). Distortion 0.25% in stereo. Image rejection 100dB. S/N 75dB. Alt channel selectivity 70dB. Separation 50dB@1kHz. Spurious rejection 100dB. SCA rejection 60dB.

FRONT PANEL: Glass front panel with black & gold escutcheon. Volume with on-off switch. Tuning ctrl. Push Buttons: 6 presets, Enter, Mute, Manual, Scan up, Scan down. LED column tuning/signal. Digital frequency readout. Headphone jack.

BACK PANEL: Audio out 2.5V variable, 1V fixed. Manual AFL sw: out or normal. Remote scan jack. 300 or 75 ohm fm cable inputs. Scope outputs. Panloc mounting.

Size 3-5/8"H, 16"W and 14-1/2"D from front panel.. Weight 18 lb. Sold from 1983-1985. Last retail price $1499.00

MR 510 FM tuner.

FRONT PANEL: Glass front panel with black & gold escutcheon. Volume with on-off switch. Tuning ctrl. Push Buttons: 6 presets, Mono, Enter, Manual, Scan up, Scan down. LED column tuning/signal. Digital frequency readout. Headphone jack.

BACK PANEL: Audio out 2.5V variable, 1V fixed. Manual AFL sw: out or normal. 15 pin remote control receptacle. 300 or 75 ohm fm cable inputs. Scope outputs. Panloc mounting.

Size 3-5/8"H, 16"W and 14-1/2"D from front panel.. Weight 18 lb. Sold from 1986-1990. Last retail price $1699.00

MR 7082 AM-FM tuner.

FM SECTION: Sensitivity 13dBF or 1.22uV across 75 ohms. Stereo 50dB quieting sensitivity 37dBF or 20uV across 75 ohms. Response 20-15kHz (+0 -1dB). Distortion 0.08% in stereo. Capture ratio 1.5dB. Image rejection 90dB. S/N 75dB stereo. Alt channel selectivity 55dB. Spurious rejection 100dB. AM suppresion 60dB.

AM SECTION: Sensitivity 35uV. Response 20-4.5kHz (+0 -6dB). Distortion 0.3%. Adjacent channel selectivity 40dB. S/N 65dB. Image rejection 60dB.

FRONT PANEL: Glass panel top. Black anodized bottom. Push Buttons: AM, FM, Search, Manual, Power, Mono, Monoplus, Stereo, 7 presets, Scan up, Scan down, Enter. Tuning ctrl. LED indicators: tuning and signal.

BACK PANEL: Audio out fixed. Built-in ferrite loopstick. Ext am antenna. 15 pin remote control receptacle. 75 ohm fm cable input. Panloc mounting.

Size 5-7/16"H, 16-1/8"W and 13"D behind panel. Weight 15 lb. Sold from 1986-1990. Last retail price $1579.00

MR 7083 & MR 7083(W). AM-FM tuner.

FM SECTION: Sensitivity 11.25dBF or 1uV across 75 ohms. Stereo 50dB quieting sensitivity 37dBF or 20uV across 75 ohms. Response 20-15kHz (+0 -1dB). Distortion 0.12% in stereo. Capture ratio 1.5dB. Image rejection 80dB. S/N 75dB stereo. Alt channel selectivity 70dB. Separation 50dB@1kHz. Spurious rejection 100dB.

AM SECTION: Sensitivity 20uV. Response 50-6kHz NRSC. Distortion 0.5%. Adjacent channel selectivity 45dB. S/N 60dB. Image rejection 65dB.

FRONT PANEL: Glass panel top. Black anodized bottom. Front panel width was 16-1/8" in early units and 17-1/2" in later units. Push Buttons: AM, FM, Spatial, Power, Mono, Stereo, 8 presets, Search, Scan up, Scan down, Enter. Tuning ctrl. LED indicators: tuning and signal. Digital frequency readout.

BACK PANEL: Audio out 1.2V (rear ctrl), 1.2V fixed. Built-in ferrite loopstick. 15 pin remote control receptacle. Ext am antenna. 75 ohm fm cable input. Scope outputs. Panloc mounting.

Size 5-7/16"H, 16-1/8"W and 13"D behind panel. Weight 15-1/2 lb. Sold from 1990-1995. Last retail price $1750.00

MR 7084 AM-FM tuner.

FM SECTION: Sensitivity 15dBF or 1.6uV across 75 ohms. Stereo 50dB quieting sensitivity 39dBF or 25uV across 75 ohms. Response 20-15kHz (+0 -1dB). Distortion 0.12% in stereo. Capture ratio 1.5dB. Image rejection 80dB. S/N 75dB stereo. Alt channel selectivity 70dB. Separation 50dB. Spurious rejection 100dB.

AM SECTION: Sensitivity 20uV. Response 50-6kHz NRSC. Distortion 0.5%. Adjacent channel selectivity 45dB. S/N 60dB. Image rejection 78dB.

FRONT PANEL: Glass front panel. Push Buttons: 0 to 9 keypad for 50 presets, Tune up, Tune down, AM, FM, Spatial. Enter, Review, and Power. LED signal strength bar. Digital frequency and preset readout.

BACK PANEL: Audio out 1.2V (rear ctrl), 1.2V fixed. Built-in ferrite loopstick. Preset clear button. Data in/out jacks for remote . Ext am antenna. 75 ohm fm cable input. Scope outputs.

Size 3-5/8"H, 17-1/2"W and 17-1/2"D behind panel. Weight 15 lb. Sold from 1995-. Last retail price $1500.00

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