Harman Kardon 50+

[ChicagoHiFi]

Hey everyone… I’m pretty new to the site and I’m looking for info on my Harman Kardon 50+. I bought this receiver for $100 locally in Chicago. It’s in really good condition and it sounds great. It’s also quad. But I can’t seem to find any info on it. There’s a hifi engine forum on it but that’s about it. And Just Audio has one forsale at the ridiculous price of $600. (I attempted selling mine for $200-150 on FB marketplace and had no luck) What is this receiver? Does anyone know?

 

[swechsler]

Does the owners manual on hifiengine not have any info?

 

[BMWCCA]

Here's a discussion with more info than I've seen elsewhere:

https://audiokarma.org/forums/index.php?threads/harman-kardon-50-quad-receiver.391526/

Seems the "50+" refers to the total power of all four channels.

From the thread linked above:

From a H/K 50+ flyer.
Continuous Power (Stereo): 25 watts, RMS, per channel into 8 ohms at 1 kHz.
Continuous Power (Quad): 4 x 12 1/2 watts, RMS, per channel into 8 ohms at 1kHz.
Total Harmonic Distortion: 0.3% at l kHz.
Intermodulation Distortion: 0.5% (40 & 4,000Hz) 3dB down in power.
Frequency Response: 18-74,000 hertz ± 1.0dB.
Power Bandwidth: 28-30,000 hertz, 3 dB down.
Matrix Phase Differential: 0° to ± 6°.
Matrix Overload: 4 volts, RMS, 20-20kHz.
Matrix Frequency Response: 20-20kHz (uniform amplitude)
Hum and Noise: Phono: -60dB, Aux: -63dB.
Damping Factor: 20 into 8 ohms.
Bass Control: ± 12dB at 50 hertz.
Treble Control: ± 12dB at 10kHz.
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.
Size:15-5/8" Wide x 12-3/4" Deep x 4-3/4" High (less knobs)
Weight: 18 pounds.
Model CW25 optional walnut enclosure.