TA-N900
(october 1980 - 1984+)

The second ESPRIT unit and a Stereo Sound Best Product in the winter of 1981. Also a bestseller for Sony - probably the most common ESPRIT unit and an excellent amplifier, companion of the very rare TA-E900.

Pre-power stage:
1st: Bootstrapped double cascode FET differential input, with current-mirror output
2nd: Bootstrapped cascode inverted amp
3rd: emitter follower SEPP output
Power stage:
No NFB loop, pure complementary SEPP output in Class A operation
Power devices:
4 complementary pairs of enhancement type MOS-FETs (2SK173/2SJ54)
Power Supply:
Pulse Locked Power Supply
Heat regulation:
Heat Pipe with BSL wheel fan for accelerated air flow

Low-TIM design
27dB open loop gain
2x 22,000µF smoothing caps
20kHz PLPS chopping rate
99,99% pure copper wiring
2 / 4 / 8...16 Ohm selector

The full technical description will soon be online here - stay tuned !