HK 680I

HK 680I

Stereo Receiver (60 watts x 2)

Sold from 1981 until 1983

Predecessor Product: HK 670
Successor Product: HK 690I
Made in: Japan

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Product Specifications

MSRP U.S.
$649.95 each
Usable Sensitivity
FM... MONO – 1.8uV
Quieting Sensitivity
FM... MONO – 3.0uV
Quieting Sensitivity
FM... STEREO – 35uV
Signal-to-Noise Ratio
FM... STEREO – -75dB
Capture Ratio
FM... 1.0dB
Alternate Channel Selectivity
FM... 75dB
IF Rejection
FM... 100dB
AM Rejection
FM... 65dB
Stereo Separation
FM... 48dB @ 1kHz
Total Harmonic Distortion
FM... MONO – 0.09% 1kHz, 100% modulation
Total Harmonic Distortion
FM... STEREO – 0.1% 1kHz, 100% modulation
Sensitivity
AM... 300uV/m
Alternate Channel Selectivity
AM... 50dB
Image Rejection
AM... 40dB
IF Rejection
AM... 25dB
Amplifier Power (RMS)
60 watts @ <0.02% THD primarily low order harmonics @ 8 ohms from 20Hz – 20kHz
Power Bandwidth
HALF POWER – <10Hz – 100kHz with 8 ohms
Frequency Response
<1Hz – 150kHz (+0/–3dB @ rated output)
Total Harmonic Distortion
0.01% primarily low order harmonics 1kHz @ rated output
Transient Intermodulation Distortion (TIM)
0.08% @ rated output
High Instantaneous Current Capability (HCC)
± 30 Amps
Slew Rate
70 volts/uSec
Rise Time
SQUARE WAVE – better than 1.8uSec @ 20kHz
Square Wave Tilt
<3% @ 20Hz
Negative Feedback
25dB
Damping Factor
>60 @ 8 ohms, 20Hz – 20kHz
Hum and Noise
PHONO – -88dB A-WTD
Hum and Noise
AUX – -100dB A-WTD
Input Sensitivity
PHONO – 2.2mV AUX -130mV
Phono Input Sensitivity
RESISTANCE – 47k ohms
Phono Input Sensitivity
CAPACITANCE – 135pF
Phono Overload
>230mV
RIAA Equalization
±0.5dB

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