Kenwood KA-900 stereo amplifier - silver / grey :
The Kenwood KA-900 model is an early 80s stereo amplifier with plastic case and glass panel for contols, rated at 80W RMS
The Vintage Knob : Smaller sibling to the KA-1000 - single transformer, integrated power supply and a smaller Heat-Pipe. The rest is nearly identical
With High-fT transistors, a DC...400Khz bandwidth, 2 x 80W (20Hz...20Khz), a slew rate of ±120V, a 0.9μs rise-time and a 500 damping factor at 100Hz,
the KA-900 was a tight and futuristic way to start the 1980s... even if the case is made of plastic
The non-magnetic chassis always is a surprise to discover "in the flesh"... it is made of plastic !
This explains the somewhat sloping parts and top covers one can see in the catalogues : plastic doesn't like heat nor does it age well
The front window of the KA-900 is however made of real glass, not easy-to-scratch acryl or perspex
The KA-900 was a fine example of high-end Hi-Fi navigating between the 1970s robustness and 1980s trendy trends in technology as well as design
Specifications :
-:®:- 1980 to 1982 vintage
-:®:- Power rating : 80W RMS at 8 ohms [THD 0.005%]
-:®:- Total harmonic distortion : Aux: 0.005% [at rated power, 8ohms], 0.005% at 42.5W, phono to speaker out: 0.007% at -20dB level
-:®:- Input sensitivity / impedance : Phono: MM 2.5mV / 47kohms,
-:®:- Tuner, Aux, Tape A, Tape B: 150mV / 47kohms
-:®:- Speaker outputs : A, B, A + B - speakers impedance 4 to 16 ohms
-:®:- Transient response : Rise time: 0.9μsec, slew rate: ±120V/μsec
-:®:- Headphones out : 6.3mm jack
-:®:- Frequency response : DC ON: DC to 400kHz -3dB, OFF: 18Hz to 400kHz - 3dB, phono: 20 to 20kHz ±1.2dB
-:®:- Signal to noise : Phono: 86dB for 2.5mV input, 92dB for 5.0mV input, MC: 66dB for 0.2mV, 72dB for 0.4mV input
-:®:- Tuner, tape A, B, Aux: 105dB for 150mV input
-:®:- Input sensitivity / impedance : Phono: MM: 2.5mV at 33kohms, 47kohms and 100kohms, MC: 0.2ohms / 100ohms
-:®:- tuner, Aux, tape A,B: 150mV for 47kohms
-:®:- Maximum input level : MM: 270mV RMS [0.003% THD at 1kHz], MC: 15mV RMS [0.003% THD at 1kHz]
-:®:- Output level / impedance : Tape Rec: phono in: 150mV for 330ohms, DIN: 30mV for 80 kohms
-:®:- Tone controls : Bass: 200Hz: ±10dB at 50Hz, 400Hz: ±10dB at 200Hz
-:®:- Treble: 3kHz: ±10dB at 10kHz, 6kHz: ±10dB at 20kHz
-:®:- Loudness filter : +10dB at 100Hz, and -30dB volume level, subsonic filter : at 18Hz, 6dB/octave
-:®:- Damping factor : 500 [8ohms, 100Hz]
-:®:- Dimensions [W x H x D]: 440 x 123 x 375mm
-:®:- Weight : 10.0kg, packed weight : ~ 11.5kg
SOLD September 2015 on trademe to Christchurch
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