Part of Sony's first big push toward HIGH fidelity, along the ST-5000 FM tuner, TA-1120 integrated, TA-4300 frequency divider and TTS-3000 LPdrive.
In other words : the original ES series !
Still today an excellent preamp and, swapping a few parts, easy to turn into a HIGH-end unit... today.

To be mated with the half-width TA-3120A stereo power amp for a multi-amped system, the latter being a TA-1120 stripped down of its preamp section.

Sony would await a long time to give some of its unit the same moniker : SL-2000 Beta recorder, LDP-2000 professional Laserdisc player (1985), TAE-2000ESD Home Theater preamp/processor (1992) and DTC-2000ES DAT recorder (1993). The LDP being the Schumacher of LD players, the TAE having been hailed as the best DPL processor and the DTC being the best DAT recorders ever.

The 2000 was replaced by the TA-2000F in 1971 (F for FET), that version remaining available in Japan far longer than elsewhere - probably the best proof possible that these still are worth buying... today.