Kenwood KA-8100

Kenwood KA-8150

1 9 7 7 june 1977
1 9 7 8 1978

Smaller sibling to the KA-9100, less powerful but just as carefully built.

The x100 series was export-only : KA-9100, KA-8100, KA-7100 & KA-6100.
There is a japanese KA-8100 but it is a 1978 lower-end amp with only one transformer and more modern plastic-case transistors, visually closer to the KA-907.

Two transformers, 4x 10,000µF caps and relay-protected output for the DC power supply and amp stages, voltage-regulated preamp stage, back-deported input selector and clear separation of large current / small current areas.

The phono stage is made of a 3-stage FET differential amp with current-mirror load (1st stage), Darlington circuit with current-mirror load (2nd stage) and complementary SEPP output.
The inputs are directly connected to their EQ stages of the preamp board.

Feature are galore, if not "audiophile" by todays' standards : 2-way loudness switch, high, low and subsonic fliters, dual-frequency tone controls and ±10dB input gain switch.

I believe the 2-gang logarithic volume pot to be the same as that of the KA-7300.

Being 1977, this is all metal and the D-7 rack handles were available to make you feel you did get a KA-9100 at a reduced price.

Besides the two TECH tabs here, you can read Zeljko's review of the KA-9100 for the basics of this well remembered series of Kenwood integrated audio amplifiers.

You can also see nudies aplenty of a complete restoration at Curt June's.

Kenwood KA-8100, image 1 Kenwood KA-8100, image 2 Kenwood KA-8100, image 3
Kenwood KA-8100 specifications
Title Value
POWER section POWER section
Power : 2x 75W (RMS, 8 Ohm, 20Hz...20Khz)
2x 90W (1Khz, 4 Ohm)
Dynamic output : 330W (4 Ohm)
THD : 0,03% (rated power, 8 Ohm)
0,01% (1W, 8 Ohm)
Power bandwidth : 5Hz...50Khz
Frequency response : DC...100Khz (+0 / -1,5dB)
S/N ratio : 115dB
Damping factor : 50 at 8 Ohm
Input : 1V / 50kOhm
Speakers : 4...16 Ohm
PREAMP section PREAMP section
Inputs : 2,5mV / 50kOhm (Phono 1&2)
150mV / 50kOhm (lines)
S/N ratio : 85dB (2,5mV input, Phono)
91dB (5mV input, Phono)
97dB (10mV input, Phono)
110dB (2,5mV input, lines)
Max. input : 250mV (Phono 1, 0,02% THD, 1Khz)
Outputs : 150mV / 220 Ohm (tape RCA)
30mV / 80kOhm (tape DIN)
1V / 470 Ohm (preamp)
Frequency response : ± 0,2dB RIAA
7Hz...50Khz (lines, +0/-1dB)
Bass control : ± 7,5dB at 50Hz (turn. 150Hz)
± 7,5dB at 100Hz (turn. 400Hz)
Treble control : ± 7,5dB at 10Khz (turn. 3Khz)
± 7,5dB at 20Khz (turn. 6Khz)
Loudness control #1 : +3/+6/+9dB at 50Hz
Loudness control #2 : +3/+6/+9dB at 100Hz
Gain control : +10 / 0 / -10dB
Subsonic filter : 18Hz, 6dB/octave
Low filter : 40Hz 12dB/ocatve
High filter : 8Khz 12dB/octave
General General
PC : 600W (full power)
Dimensions : 43 x 14,9 x 38,4cm
Weight : 14,5kg.
Kenwood KA-8100 : 0 topic
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page online since : august 2007
page updated : january 2011
page type : LGT / KNB
page weight : 186.52 Kb / 3.89 Mb

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