RARE! Harman Kardon 50+ Quadraphonic/Stereo 50 Watt Hifi Receiver 1973 Japan

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I'll have the one from the top shelf, if you please...

Here is a 1973 Harman/Kardon 50+ Quadraphonic/Stereo Receiver. It's an absolute gem. Green light with VU meter under black glass. 50 watts (12.5 watts × 4 channels @ 80hms). Usable in stereo or quad. Crystal clear sound. It's 23lbs of vintage hi-fi goodness. This unit has not been recapped or restored and is in original condition with a two-pronged power cord. Tested and working as it should.

• Clean black-glass dial

• Bright green LED dial illumination

• Brushed aluminum faceplate

• Strong, readable lettering

• Knobs and pushbuttons are present and

clean

• Tuning meter illuminates

• Rear panel is readable

• Interior appears clean and orderly

• Normal age-appropriate wear consistent with a vintage receiver

• Model: Harman/Kardon 50+ • Serial No.: 24961579 • Made in Japan • AC: 117V. 60Hz • Power consumption: 140W . AC fuse: 2A / 250V • DC fuses: Right / Left 1.5A / 3AG • Switched AC outlet: 200W max • Inputs include Phono • Discrete Phono / Aux Front / Back • Tape Monitor Front / Back • Tape Out Front / Back • Front and Back speaker outputs • FM 300Q antenna connection • AM antenna connectior • Ground terminal • Quad / multichannel switching

Number of Transistors

Semiconductors present.

Semiconductors

Main Principle: Superheterodyne (common)

Wave Bands: Broadcast (BC) and FM or UHF.

Details: Radio with phono and aux.

Power type and voltage: Alternating Current supply (AC) / 110 Volt

Loudspeaker: This model requires external speakers.

Power Out: 50 W (unknown quality)

Material: Metal & Brushed Steel

from Radiomuseum.org:

Model: Multichannel Receiver Model 50+ - Harman Kardon; New York

Shape

Book-shelf unit.

Dimensions (WHD)

420 x 155 x 350 mm / 16.5 x 6.1 x 13.8 inch

Harman Kardon Multichannel Receiver Model 50+

AM/FM Stereo 4-Kanal Receiver mit SQ-Matrix.

Continuous Power (Stereo): 25 watts, RMS, per channel into 8 ohms at 1 kHz.

Continuous Power (Quad): 4 x 12.5 watts, RMS, per channel into 8 ohms at 1 kHz.

Total Harmonic Distortion: 0.3% at l kHz.

Intermodulation Distortion: 0.5% (40 & 4,000 Hz) 3dB down in power.

Frequency Response: 18-74,000 Hz ±1.0dB.

Power Bandwidth: 28-30,000 Hz, 3dB down.

Matrix Phase Differential: 0° to ± 6°.

Matrix Overload: 4 volts, RMS, 20-20 kHz.

Matrix Frequency Response: 20-20 kHz (uniform amplitude).

FM Sensitivity: 2.8 microvolts, IHF.

FM Total Harmonic Distortion: 0.9%.

Ultimate Signal to Noise: 62dB.

Capture Ratio: 3.0dB.

IF Rejection: 60dB.

Spurious Response Rejection: 60dB.

Stereo Separation: 30dB.

AM Sensitivity: 30 microvolts.

Image Rejection: 40dB.

Made in Japan

Net weight (2.2 lb = 1 kg)

11.5 kg / 25 lb 5.3 oz (25.33 lb)

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