McIntosh MR80 VIntage FM Tuner

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General:

An excellent neo-vintage tuner from McIntosh that perfectly matches your other Mc gear, whether new or old.

The MR80 has the remarkable ability to pull in the faintest stations even with a simple whip antenna.

Comparable in performance to the legendary MR78, but with all the convenience features of a more modern tuner.

This tuner also has variable and fixed outputs in case you’d like to use it without a preamp. 

Brand Background:

McIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment based in Binghamton, New York. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products. 

McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment experience for discriminating listeners around the world. Our iconic blue Watt output meter is globally recognized as a symbol of quality home audio. With a McIntosh home stereo system or home theater, listeners have the ability to create their own luxury audio experience – and truly live their music.

Ownership:

Single Owner

Connections:

Fixed and variable RCA outputs
Coax antenna input

General Sound:

Neutral sound with little to no coloration 

Cosmetic Condition:

8 - Very Slight Signs of Use

https://skyfiaudio.com/pages/our-rating-scale

Working Condition:

Working perfectly and tested in our lab.

Included:

Just the unit and the captive power cord

Packing:

Will be packed using our highly developed in-house process and custom packing materials.

Dimensions:

Front panel measures: 406 mm (16") wide by 138 mm (5-7/16") high.
Chassis measures: 375 mm (14-3/4") wide by 122 mm (4-13/16") high by 330mm (13") deep, including connectors.

Weight:

40 lbs

Age:

1982

Reviews:

https://stereonomono.blogspot.com/2013/04/mcintosh-mr-80.html

Link to Manual:

https://www.thetubestore.com/lib/thetubestore/schematics/McIntosh/McIntosh-MR80-Owner-Manual.pdf

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best 

Testing Process:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR. Vintage analog tuners also have moving parts related to the tuning gang and dial string. These parts are inspected for smooth operation.

If the unit passes visual inspection it is bench tested for a handful of key performance parameters using a Sencore SG80 AM/FM Stereo Analyzer. The SG80 allows us to “simulate” an ideal radio station using precision test signals instead of music. This device, in conjunction with an oscilloscope allows us to properly evaluate the following parameters:

1.  AM Reception (Where Applicable)

2.  FM Mono Reception & Tuning Meter Function

3.  FM MPX Reception (Stereo)

4.  Dial Tracking - How accurately the tuner dial or display indicates the actual frequency of the broadcast being received.

5.  Stereo Separation - A properly working stereo tuner will have minimal crosstalk between the left and right channel.

6.  Sensitivity & Signal Strength Meter Function - By lowering the output of the SG80 we can simulate weak stations and determine how well the tuner will be able to pull in weak distant stations. This adjustment also helps us verify signal strength meter function.

If the tuner has acceptable performance related to the parameters above we connect the unit for listening tests with a simple dipole antenna. We listen for audio reproduction quality of local stations and evaluate how many stations the tuner can receive while we sweep through the dial. We are looking to verify that the tuner can decode stereo on strong local broadcasts and pick up a wide variety of local stations at the bottom, middle, and top of the frequency band. At this point we also test convenience features such as muting, filters, built in oscilloscope function, etc.

We finish up with an extended listening test on our long term test rig. We tune in a strong local station and monitor for drift over a 2-3 hour period.

Specs:

TUNING:  88 to 108 MHz
ANTENNA INPUTS: One 300 Ω balanced and two 75 Ω unbalanced.
INTERMEDIATE FREQUENCY: 10.7 MHz
SENSITIVITY:
9.3 dBf (1.6mV) for 35 dB of quieting
14.7 dBf (3mV) for 50 dB of quieting
13.2 dBf (2.5mV) for 3% total noise and harmonic distortion
SIGNAL TO NOISE RATIO: 75 dB below 100% modulation
HARMONIC DISTORTION: 0.2% 20 Hz to 15 kHz, mono or stereo
Typically, 0.08% at 1000 Hz
INTERMODULATION DISTORTION: 0.15% mono or stereo for any combination of frequencies from 20 Hz to 15,000 Hz with peak modulation equal to 100% or less. Typically 0.1%
FREQUENCY RESPONSE: Mono and Stereo ± 1 dB 20 Hz to 15 kHz with 75, 50 or 25ms de-emphasis
CAPTURE RATIO: 1.5 dB
SELECTIVITY:
Adjacent channel : 8 dB (Narrow); 60 dB (Super Narrow)
Alternate channel : 90 dB (Narrow); 110 dB (Super Narrow)
SPURIOUS REJECTION: 110 dB
TUNER IM (RF): -23 dBm for 2 signals 1 MHz apart
TUNER INTERCEPT POINT: -10 dBm 75W
IMAGE REJECTION: 90 dB
MAXIMUM SIGNAL INPUT: 8 volts across 75W (1W) antenna terminal will not increase harmonic or intermodulation distortion.
AUDIO HUM: 75 dB down from 100% modulation
MUTING: 70 dB noise reduction between stations
MUTING THRESHOLD: 2mV to 1000mV
SCA REJECTION: 60 dB minimum
STEREO SEPARATION: 50 dB to 1000 Hz
STEREO FILTER: 10 dB noise reduction
AUDIO OUTPUT
VARIABLE : 2.5V into 47k Ω
FIXED : 1V into 47k Ω
GENERAL INFORMATION
POWER REQUIREMENTS: 120 volts, 50/60 Hz. 
POWER Consumptions: 25 watts
SEMICONDUCTOR COMPLEMENT:
57 Transistors, 68 Integrated Circuits, 81 Diodes, 4 LED Displays, 18 LED's, 7 Neon Lamps
Knob clearance required is 32 mm (1-1/4"") in front of mounting panel.
FINISH: Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black.
MOUNTING: Mclntosh developed professional PANLOC
WEIGHT: 12,2 kg (27 pounds) net, 17,7 kg (39 pounds) in shipping carton