Kenwood L-01A

October   1 9 7 9 october 1979
1 9 8 2 1982

Getting ready for the new decade : shiny and black, filled with technology and almost bare visually, using visible heat-pipes and sealed capacitor blocks, using metal, aluminium, painted wood and acryl, nylon and plastic.

Non-magnetic chassis, full DC structure, deported switches, special Matsushita 4-gang volume control, two copper-plated heat-pipes, two sealed & aluminium potted capacitor blocks with copper tops (each holding two 18,000µF / 63V caps), gold plated miniature relays, OFC Litz (partial) wiring, FET differential inputs, four pairs of 2SA1095 / 2SC2565 power transistors, an outboard power supply with four transformers (L / R / system / phono) and shunt type regulation, a damping factor of 1000 (!), Non-Switching circuitry, swift rise times for all (output and input), 2-frequencies / 3-level loudness control, relay-operated MM & MC inputs, 400Khz bandwidth - and more.

The service manual says that the "parallel input circuit" is explained in the KHA-50 service manual and that "constant current, differential amplifier and current mirror" circuits should be studied from the L-07C and L-07M manuals.
No Sigma Drive yet, though : that came with the slightly later KA-1000 sibling.

Sound-wise, this is pure modern Kenwood : tight, very tight and fast.
The only problem turned out to be some cases of overheating of the potted caps - even if idle current is to be set at the rather low value of 18mV...

If Kenwood sold a lot of 01s in Japan and Europe, I really think it came up two or three years too early : launched along a similarily designed first CD player (unlike the L-03DP) and the L-01T, such a trio would've sold like mad in 1983/84.

Kenwood planned a full-size stunner system in 1978/79, the unbelievable LX quartet, which very sadly remained at the functional prototype stage - the L-01A is what was finally produced.

The next stopper wasn't the LX but the L-02A, after which Kenwood's adventures into high-end audio were to become even more... sporadic.

Many very detailed internal views are visible here ; a real-life L-01A here and another one here.

Kenwood L-01A, image 1 Kenwood L-01A, image 2 Kenwood L-01A, image 3
Kenwood L-01A specifications
Title Value
Power output : 2x 110W (8 Ohm, 20Hz...20Khz, 0,006% THD)
2x 120W (8 Ohm, 1Khz)
2x 170W (4 Ohm, 1Khz)
THD : 0,006% (rated power, 20Hz...20Khz, 8 Ohm, AUX in > SPK out)
0,006% (1/2 rated power, 20Hz...20Khz, 8 Ohm, AUX in > SPK out)
0,008% (rated power, 20Hz...20Khz, vol -20dB, 8 Ohm, PH in > SPK out)
IMD : 0,003% (rated power, 8 Ohm)
Damping factor : 1000 (1Khz / 8 Ohm)
Rise time : 0,7µs
Slew rate : ± 150V / µs
Power bandwidth : 5Hz...100Khz (0,03% THD)
Frequency response : DC...400Khz (-3dB, DC coupling OFF)
5Hz or 18Hz...400Khz (-3dB, DC coupling ON)
20Hz...20Khz (phono stages)
RIAA accuracy : ± 0,2dB
Speakers impedance : 4...16 Ohm
Inputs : 2,5mV / 50kOhm (MM)
0,1mV / 100Ohm (MC)
200mV / 50kOhm (tuner, aux, tape)
Outputs : 200mV / 180Ohm (REC rca)
40mV / 80kOhm (rec DIN)
Max. phono input : 250mV (MM, 1Khz, 0,01% THD)
9mV (MC, 1Khz, 0,01% THD)
S/N ratio : 90dB (MM / 2,5mV output)
95dB (MM / 5,0mV output)
102dB (MM / 10mV output)
72dB (MC / 0,1mV output)
Loudness control : +3 / +6 / +9dB at 30Hz or 100Hz
Subsonic filter : 6dB / ocatve below 5Hz or 18Hz
PC : 430W (rated power, 8 Ohm)
115W (idle)
L-01A weight : 9,5kg
L-01APS weight : 17,5kg
L-01A dimensions : 44 x 15,6 x 45,2cm
L-01APS dimensions : 17 x 15,6 x 40,3cm
Kenwood L-01A : 0 topic
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page online since : december 2008
page updated : september 2010
page type : LGT / KNB
page weight : 177.17 Kb / 0 b

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