What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Kenwood KA-6000 (1969)

Solid State Stereo Amplifier
180 watts of IHF standard total music power, enough to drive even low efficiency hi-fi speakers.
The wide power bandwidth of 10 Hz to 50,000 Hz with very low IM distortion.
Kenwood's exclusive low level phono inputs for low level output phono cartridges of 2 mV, 0,5 mV or 0,05 mV.
2 pairs of MAG input terminals for 2 set of record players.
Lever type -20 dB muting switch of quick response for momentary quietness during telephone call etc.
2 dB step type tone controls with tone mode switch.
Blue light indicators for input selector switch.
Lever type high and low filter switches.
Large volume/balance control knob located in center of frontpanel.
Pre-amplifier outputs for use with other power amplifier or multichannel system.
Main amplifier inputs for the use with other pre-amplifier, tuner and tape recorder with pre-amplifier, and also these unputs enable you to drive the main amplifier directly.
Speaker terminals for 2 sets of stereo speaker and front panel speaker selector switch.
Exclusive blow-out proof automatic circuit breaker protects power transistors.

Power Output (continous power; at any frequency from 20 -20,000 Hz):
Each channel driven;
64/64 watts at 4 ohms load.
58/58 watts at 8 ohms load.
42/42 watts at 16 ohms load.
Both channels driven;
41/41 watts at 4 ohms load
455/45 watts at 8 ohms load.
34/34 watts at 16 ohms load.
Total Music Power (IHF):
180 watts at 4 ohm load.
170 watts at 8 ohms load.

Harmonic Distortion: Less than 0,5% at rated output from 20 to 20,000 Hz
Intermodulation Distortion (60 Hz & 7,000 Hz, 4:1):
Less than 0,3% at rated output or at any level of less than rated output;
Less than 0,1% at -3 dB rated output
Frequency Response:
Main Amp. only; 10 Hz to 50,000 Hz ±1 dB
High Level Input; 20 Hz to 50,000 Hz ±1 dB
Sensitivity (from rated output at 8 ohms load):
Phono 1; 2 mV, 0,5 mV, 0,05 mV (switchable)
Phono 2: 2 mV
Tape Head: 2,3 mV
MIC: 2 mV
AUX: 200 mV
Tuner: 200 mV
Tape Play: 200 mV
Main Amp Input: 100 mV
Input Impedance (at 1,000 Hz):
Phono 1 (2 mV); 50 Kohms
Phono 1 (0,5 or 0,05 mV): 200 ohms
Phono 2; 50 Kohms
Tape Head: 100 Kohms
MIC: 100 Kohms
AUX,Tuner,Tape Play: 77 dB
Noise at minimum volume control: 1mV at 8 ohms or 0,0125 milliwatts.

Output Impedance (at speaker terminal):
0,275 ohm at 1,000 Hz
0,39 ohm at 50 Hz
0,275 ohm at 10,000 Hz
Damping Factor (at 1,000 Hz):
58 at 16 ohms load
29 at 8 ohms load
Low Filter (for rumble):
40 Hz Cutoff, 12 dB per octave
80 Hz Cutoff, 12 dB per Octave
High Filter (for scratch ): 8,000 Hz Cutoff, 12 dB per octave
Bass control: ±10 dB at 1000 Hz with 2 dB step switch
Treble Control; ±10 at 10,000 Hz with 2 dB stepswitch
Power Consumption:
AC 110-120/220-230 volts, 50/60 Hz
18 watts quiescent. 190 watts at full power
Dimensions: 16⁵/₁₆" x 5 ⁵/₃₂" x 11 ¹/₃₂" (W x H x D)
Weight: 24,5 lbs

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