Sony TA-N901

June
1 9 8 2 june 1982
1 9 8 7 1987

The little ESPRIT : two simplified TA-N900 in one box. Or almost. Not quite.

In are a 20Khz PLPS, 4/8...16 Ohm back switch, non-magnetic & twin-monaural chassis, 2x 22,000µF main caps, high-speed diode rectifiers, stabilized and regulated power-supplies, thermally stable modules and "communicating" front display.

The latter displays a large blue pad at power on, turning green after stabilization, smaller orange or red pads when temp rises too much, then overload and or protection if things go haywire.

Circuit : current-mirror cascode bootstrap differential FET > bipolar inverting amp cascode bootstrap > SEPP emitter-follower with NFb to the first stage > Class A SEPP with triple p-p of Hi-fT and no NFb loop.

The N901 sold well enough but appreciation seems to have been mixed then and still is today : some find it having "not quite right" sonic qualities, some find it ok...

If you buy one, you'll be in for a full recap' anyway as the PLPS box gets hot and the caps inside age fast.



A real N901 here.

Sony TA-N901, image 1 Sony TA-N901, image 2 Sony TA-N901, image 3
Sony TA-N901 specifications
Title Value
Power output : 2x 150W (8 Ohm, 20Hz...20Khz)
2x 130W (4 Ohm, 20Hz...20Khz)
THD : 0,1% (8 Ohm, rated output)
0,2% (4 Ohm, rated output)
IMD : 0,1% (8 Ohm, rated output)
0,2% (4 Ohm, rated output)
Damping factor : > 50 (8 Ohm, 1Khz)
S/N ratio : > 120dB (8 Ohm, input shorted)
Residual noise : < 30µV (8 Ohm)
Power bandwidth : 5Hz...80Khz
Frequency response : DC...100Khz (+0 / -3dB)
Input : 1,4V / 50kOhm
Output load : 4...16 Ohm
Internal output impedance : 0,05 Ohm
PC : 230W
Dimensions : 48 x 10,5 x 48,5cm
Weight : 13kg.
List price : 350,000¥
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