HK 670

HK 670

Stereo Receiver (60 watts x 2)

Sold from 1978 until 1980

Predecessor Product: 730
Successor Product: HK 680I

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Product Specifications

Amplifier Power (RMS)
60 watts min. per ch, both driven into 8 ohms from 20Hz – 20kHz @ less than 0.06% THD DIN 45500 – 75 watts @ 8 ohms
Power Bandwidth
8Hz – 100kHz @ < 0.08% THD into 8 ohms both channels driven simultaneously, @ 30 watts RMS per channel
Total Harmonic Distortion
0.03% 1kHz @ rated output
Transient Intermodulation Distortion (TIM)
0.05% @ rated output
Frequency Response
Below 3Hz – 140kHz -3.0dB
Frequency Response
FM – 20Hz – 15kHz (±0.5dB)
Damping Factor
> 30 @ 8 ohms
Hum and Noise
PHONO – -90dB A-weighted, IHF
Hum and Noise
AUX & RES – -102dB A-weighted, IHF
Slew Rate
65V/usec
Rise Time
SQUARE WAVE – 2.5usec @ 20kHz
Square Wave Tilt
<2% @ 20Hz
Negative Feedback
28dB
Input Sensitivity
PHONO – 2.2mV
Input Sensitivity
HIGH LEVEL – 130mV
Phono Overload
>225 mV
Input Impedance
PHONO – 47k ohms
Quieting Sensitivity
MONO – 3.0uV
Quieting Sensitivity
STEREO – 30uV
Signal-to-Noise Ratio
FM – -75dB
Image Rejection
-80dB
IF Rejection
-110dB
Stereo Separation
55dB @ 1kHz
Distortion
FM MONO – 0.05% @ 1kHz, 100% modulation
Distortion
FM STEREO – 0.08% @ 1kHz, 100% modulation
MSRP U.S.
$569.95 each
Usable Sensitivity
FM MONO – 1.9uV
Capture Ratio
FM... 1.2dB
Alternate Channel Selectivity
FM... 75dB
AM Rejection
FM... -62dB
Sensitivity
AM... 300uV/meter
Selectivity
AM... -40dB
Alternate Channel Selectivity
AM... 35dB
Image Rejection
AM... -50dB @ 1kHz
IF Rejection
AM... -45dB @ 1kHz

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