Well maintained in Excellent Condition. Stations are selected easily in any one of these ways. Use the manual tuning knob. Use the SCAN up or down touchbuttons. Use the preset station touchbuttons or. Use the SEARCH which will preview the preset stations for 5 seconds each. The sound enhancing SPATIAL audio processor provides an aural picture that is more “stereo like” in quality and dimension. High quality tape recordings of FM broadcasts can be made without the interference that stereo transmissions can cause. Carefully designed suppression circuits eliminate the potential for stereo carrier noise when making “off the air” tape recordings. A unique Phase Locked Loop Multiplex decoder delivers STEREO FM with lower distortion, lower noise, and better separation. In a remote location, a conventional’long wire’ antenna can be used. The MR 7083 can be remote controlled from a Mclntosh IR Remote Control system. Preset memory is retained even when AC power is turned off. Three Modes of Tuning. A traditional tuning knob as well as a push button scan and preset buttons are provided. Exact digital display of tuned frequency. Each time a frequency change takes place it locks on the center of the channel. Automatic muting when changing stations. Solid State Tuning Indicators. 9 LED Signal strength bar indicates signal strength. 3 LED signal centering display allows for precise center tuning. Both fixed and variable audio outputs included. Double Balanced Mixer and 4 RF circuits that are tuned by matched varactor diodes. The results are high spurious rejection and great sensitivity. This circuitry and high tuning voltage eliminate RF inter modulation distortion caused by diode nonlinearities. The FM IF section uses 2 transistors, 3 linear phase piezoelectric filters, and 2 integrated circuits. They combine to provide over 120dB of gain and a selectivity greater than 70dB. Limiting, muting, signal strength drive, and FM detection are all functions of the LA 1235 integrated circuit. Phase Locked Loop (PLL) Stereo Decoder. A phase locked loop (PLL) stereo decoder integrated circuit, the TCA 4500A, is the heart of the multiplex section. It has a high signal to noise ratio, low distortion, high channel separation, and high SAC rejection. The PLL MPX IC eliminates inductors to minimize drift, provides integral lamp driving capability for stereo indication, and has transient free mono/stereo switching. LC Tuned Notch Filter. Following the PLL MPX decoder an LC tuned notch filter is used to prevent tape recorder bias interference. The LC filter is driven from the MPX output amplifier and is terminated by an operational amplifier. This provides the necessary filter input and output impedances for proper phase response. Display Provisions Scope outputs allow an oscilloscope to be connected for viewing FM Multipath, station signal strength and center tuning accuracy. USABLE SENSITIVITY: 11.25 dBF which is 1.0 V across 75 ohms. Mono : 15 dBF which is 1.6 V across 75 ohms. Stereo : 37 dBF which is 20 V across 75 ohms. SIGNAL TO NOISE RATIO. Mono : from 20 to 15,000 Hz (+ 0, -1dB). Stereo : from 20 to 15,000 Hz (+0, – 1dB). 0.08% at 100 Hz. 0.08% at 1000 Hz. 0.12% at 10,000 Hz. CAPTURE RATIO: 1.5 dB. ALTERNATE CHANNEL SELECTIVITY: 70 dB. IMAGE RESPONSE: 80 dB. STEREO SEPARATION: 50 dB. 50 dB at 30% modulation. 60 dB at 100% modulation. HARMONIC DISTORTION: 0.5% maximum at 30% modulation. FREQUENCY RESPONSE: 50 Hz to 6,000 Hz NRSC. ADJACENT CHANNEL SELECTIVITY: 45 dB minimum IHF. IMAGE REJECTION: 78 dB minimum. Fixed: 1.2 V RMS at 100% modulation. Variable: 1.2 mV to 1.2 V at 100% modulation. POWER REQUIREMENT: 120V 50/60Hz. POWER CONSUMPTION: 10 watts. DIMENSIONS (W x H x D): 406 x 138 x 330 mm (16-1/8″ x 5-7/16″ x 13) from the mounting surface, including PANLOC shelf and back panel connectors. Knob clearance required is 1-1/4 inches (3.2 cm) in front of the mounting panel. Front panel is glass with special gold/teal nomenclature illumination and black with gold anodized aluminum. Exclusive Mclntosh developed professional PANLOC. The item “McIntosh MR7083 AM/FM Stereo Tuner Pristine” is in sale since Monday, July 6, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Tuners & Tube Tuners”. The seller is “mkeb2000″ and is located in Agoura Hills, California. This item can be shipped worldwide.
- Model: MR7083
- Country/Region of Manufacture: Unknown
- Brand: McIntosh
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