USED UNIT, SERVICED AND IN WORKING CONDITION

In the early '60s, before Japan had established itself as the electronics juggernaut it would become, Akai introduced "Roberts" – rebadged Akai gear designed to appeal to Americans. The 770 was one of the first, essentially an Akai M-7 with cross-field heads. While the Roberts 770X is fairly common, the early 770 with built-in tube amp is a fairly obscure 4-track deck. 

Factory Specs

Type  4-track, 2-channel, stereo/monaural open reel tape system

Heads  1 x record/playback, 1 x bias, 1 x erase

Motor  2 speed hysteresis synchronous

Reel size  up to 7 inch reel

Tape speeds  1 7⁄8 3 3⁄4 7 1⁄2 ips

Wow and flutter  0.15% (7 1⁄2 ips)

Frequency response  40Hz to 23kHz (7 1⁄2 ips)

Signal to Noise Ratio  40dB

Total harmonic distortion  3%

Crosstalk  53dB

Output  800V (line)

Speakers  5 x 7" oval

Valve complement  2x EF86, 2x 12AD7, 2x 6BQ5, 2x 6X4, 1x 6AR5

Dimensions  20.08" x 13.39" x 8.90"

Weight  47.40 lbs.