HK 503

HK 503

Stereo Integrated Amplifier (40 watts x 2)

Sold from 1978 until 1980

Predecessor Product: A401
Successor Product: PM 640

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Product Specifications

MSRP U.S.
$279.95 each
Dimensions (H x W x D)
5-5/8 (w/feet) x 16-3/4 x 12-1/2 (w/knobs and AM loop)
Amplifier Power (RMS)
40 watts per channel @ <0.04% THD primarily low order harmonics @ 8 ohms from 20 – 20kHz DIN 45500 – 57 watts @ 8 ohms
Power Bandwidth
HALF POWER – 10Hz – 100kHz @ half rated output into 8 ohms
Frequency Response
below 1Hz – 120kHz, -3dB @ rated output
Total Harmonic Distortion
0.03% primarily low order harmonics 1kHz @ rated output
Transient Intermodulation Distortion (TIM)
0.06% @ rated output
Transient Intermodulation Distortion (TIM)
0.02%
Slew Rate
65 volts/uSec
Rise Time
SQUARE WAVE – better than 2.5usec @ 20kHz
Square Wave Tilt
< 3% @ 20Hz
Negative Feedback
28dB
Damping Factor
> 30 @ 8 ohms
Hum and Noise
PHONO --88dB A-WTD
Hum and Noise
AUX & RES --100dB A-WTD
Input Sensitivity
PHONO -2.2mV
Input Sensitivity
AUX – 170mV
Input Impedance
PHONO – 47k ohms
Phono Overload
>120mV
RIAA Equalization
±1dB

Stereo Integrated Amplifier (40 watts x 2)

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