McIntosh MR - 7083 Digital Stereo Tuner -, No Box

Preset stations 16 station memory presets are available 8 for AM and 8 for FM stations. preset memory is retained even when AC power is turned offThree Modes of Tuning A traditional tuning knob as well as a push button scan and preset buttons are provided.Digital Display Exact digital display of tuned frequency.Center Tuning Lock Each time a frequency change takes place it locks on the center of the channel.Auto Muting Automatic muting when changing stations.So...lid State Tuning Indicators 9 LED Signal strength bar indicates signal strength. 3 LED signal centering display allows for precise center tuning , Versatile OutputsBoth fixed and variable audio outputs includedDMOSFET RF Amplifier 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. stationsFM IF Section 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.
SpecificationsFM SECTIONUSABLE SENSITIVITY:  11.25 dBF which is 1.0 μV across 75 ohms50dB QUIETING SENSITIVITY:Mono : 15 dBF which is 1.6 μV across 75 ohmsStereo : 37 dBF which is 20 μV across 75 ohmsSIGNAL TO NOISE RATIO:Mono : 80 dBStereo : 75 dBFREQUENCY RESPONSE:Mono :  from 20 to 15, 000 Hz (+ 0, -1dB)Stereo :  from 20 to 15, 000 Hz (+0, - 1dB)HARMONIC DISTORTION:Mono :0.08% at 100 Hz0.08% at 1000 Hz0.12% at 10, 000 HzStereo :0.08% at 100 Hz0.08% at 1000 Hz0.12% at 10, 000 HzINTERMODULATION DISTORTION:Mono : 0.08%Stereo : 0, 12%CAPTURE RATIO:  1.5 dBALTERNATE CHANNEL SELECTIVITY:  70 dBSPURIOUS RESPONSE:  100dBIMAGE RESPONSE:  80 dBSTEREO SEPARATION:  50 dBAM SECTIONSENSITIVITY:  AM 20 μV external antenna input (50 ohm source input)SIGNAL TO NOISE RATIO:50 dB at 30% modulation60 dB at 100% modulationHARMONIC DISTORTION:  0.5% maximum at 30% modulationFREQUENCY RESPONSE:  50 Hz to 6, 000 Hz NRSCADJACENT CHANNEL SELECTIVITY:  45 dB minimum IHFIMAGE REJECTION:  78 dB minimumGENERAL INFORMATIONAUDIO OUTPUT:Fixed:  1.2 V RMS at 100% modulationVariable:  1.2 mV to 1.2 V at 100% modulationSEMICONDUCTOR COMPLEMENT:Transistors 37Integrated Circuits 28Varactors 8LEDs 53Diodes 74POWER REQUIREMENT:  120V 50/60HzPOWER CONSUMPTION:  10 wattsMECHANICAL INFORMATIONDIMENSIONS (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.FINISH:Front panel is glass with special gold/teal nomenclature illumination and black with gold anodized aluminum. Chassis is black.MOUNTING:Exclusive Mclntosh developed professional PANLOCWEIGHT:   7.0 kg (15½ pounds) net;  12.5 kg (27½ pounds) in shipping carton

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