Sony TA-3120

Bestselling third-width power amp made for multi-amped speakers -as seen in many late 1960s and early 1970s japanese rigs- with a 100Khz (3120) or 180Khz (3120A) response.

The two versions look identical but the later "A" sees much improved THD specifications, a damping factor closer to that of the TA-3060, slightly modified power PCB and no front "safety" LED. That version was launched at the same time as the "A" version of the TA-1120.

A back switch activates a low-cut filtering everything below 30Hz (3120) or 15Hz (3120A) ; the "test" position allows response to go naturally down to 10Hz for both versions.

Each 3120 and 3120A was delivered with an individual inspection cards stamped by Mr K. Ishikawa ; cards spotted throughout the years invariably show residual noise as low as 0,0017µW, THD as low as 0,027% at 50mW or 0,03% at rated output - even better than the official specifications.

(images shown here are of the original 3120, from the japanese and canadian dedicated catalogs)