The REAL fisrt ES integrated amplifier which, however, was not available outside Japan.

The TA-F777ES was designed by Mr Takashi Kanai, senior designer at Sony (and still active at Sony today), unlike the TA-F555ES best-seller which was designed later, compeletely separately and by somebody else... The reasons for this separation of designs is a mystery but quite typical from Sony :)
However, to make things even, the structure of the updated TA-F555ES II took much of the original F777ES, only smaller, and was tagged, just like the latter, a Best Product in early 1985 (the F555ES wasn't).

At 19kg, 2x 180W on 4Ohm loads and up to 2x 550W on 1Ohm loads, the TA-F777ES was no toy but is now quite rare - why Sony kept it available for only a year in Japan and didn't export it either is also a mystery. Originally meant to receive wood sideburns... just like the F555ES II. The power transformers found their way into the contemporary ESPRIT TA-N902.

Sony's last two-channel audiophile was the TA-FA777ES - a way to close the circle.

This post will be updated later on with the real technical meat ! (and a better stitching of the scan :)