Kenwood KA-7002

Circa
1 9 7 1 c.1971
Circa
1 9 7 2 c.1972

Big little 33cm DC-coupled integrated amplifier of... 10kg - the thirty kilo monsters were for later years.

If I deciphered properly the poetic translation of this rare and undated catalog... :

The differential amp stage is made around hi-temperature transistors in the first and second stages, with a Zener diode stabilizing the 1st stage, by way of 100% counter-DC current... to stabilize static mechanical charge in the loudspeakers' voice coils.
As this differential amplification is also present in the DC stage, good phase characteristics are maintained and the damping factor rises to 45 at 8 Ohm.

The phono EQ stage is of the three-stage NF type, dervied from the circuits of the [earlier] KA-6000.
The sharp 18db/octave two-position low filter uses a tantalum capacitor with 1mA dispersion current to avoid "thumping" when switching the filter on or off.

The balance function has a "MIX" position that, when enabled, makes the sound disappear when the balance knob is tweaked to perfect stereo equivalence ; the "null balance" switch comes handy when listening to monophonic sources... with the mono out terminal - real mono !

The volume attenuator is a 5-gang, quite probably from ALPS, as almost always.

I give up trying to make sense of the description of the elaborate protection circuit - too incomprehensible to be (re)(re)translated.

But the six BLUE LEDs must have cost a fortune in 1971 ! Of course no LEDs here but incandescent bulbs shining through coloured plastic. But it is the intention that counts :)


The mention of 4-channel compatibility (through an in/out loop) should make this rare Kenwood of unknown lineage a circa 1971 or 1972 vintage.

The layout is furthermore somewhat close to the Supreme Series which were launched in 1974, seven years after the original Supreme 1.

Kenwood KA-7002, image 1 Kenwood KA-7002, image 2 Kenwood KA-7002, image 3
Kenwood KA-7002 specifications
Title Value
Total dynamic IHF power : 196W (both channels, 4 Ohm)
170W (both channels, 8 Ohm)
Continuous power output : 2x 80W (each channel driven, 4 Ohm)
2x 70W (each channel driven, 8 Ohm)
2x 68W (both channels driven, 4 Ohm)
2x 50W (both channels driven, 8 Ohm)
THD : < 0,5% at rated output
IMD : < 0,3% at rated output
< 0,1% at -3dB rated output
Frequency response : 20Hz...50Khz (± 1dB)
Inputs : 2,5mV / 30kOhm or 50kOhm (phono 1)
2,5mV / 50kOhm (phono 2)
0,06mV / 200 Ohm (phono 2)
2,5mV / 50kOhm (mic)
200mV / 100kOhm (aux 1 & 2)
200mV / 100kOhm (tape play 1 & 2)
1V / 50kOhm (main amp in)
4channel stereo input
Outputs : 4channel stereo
preamp
mono
tape 1 & 2 (RCA & DIN)
S/N ratio (below rated output) : 65dB (phono 1 ; 2,5mV input)
65dB (phono 2 ; 2,5mV input)
45dB (phono 2 ; 0,06mV input)
67dB (mic.)
77dB (lines)
Damping factor : 90 at 16 Ohm load
45 at 8 Ohm load
Low filter : 18dB/octave below 40Hz or 80Hz
High filter : 18dB/octave above 7Khz
Bass control : ±10dB @ 100Hz ; 150Hz or 300Hz turnovers
Treble control : ±10dB @ 10Khz ; 2Khz or 6Khz turnovers
PC : 15W idle
275W at full power
Dimensions : 33 x 13,3 x 27,8cm
Weight : 10kg.
Kenwood KA-7002 : 0 topic
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page online since : june 2008
page updated : october 2010
page type : LGT / KNB
page weight : 157.36 Kb / 0 b

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