TA-F808ES
TA-F707ES
(1993 - 1994)

The last integrated amplifier of the "classic" ES line and a discrete update of the previous TA-F770ES and TA-F870ES. The main update consists of the addition of MOS-FET transistors in the driver stages, whereas the previous 770/870 only sported these in the power stages. Also, better componentry here and there.
The 808 has the same badge -litterally- glued -litterally- as was glued on the 870. The 808 is a japanese TA-F555ESJ and the 707 a japanese TA-F333ESJ. I believe the original versions to have been deprived of the pre-out and the Control S plugs [?] but, given Sony's complex market-related naming and even lettering schemes, this remains to be confirmed :-) And don't ask me why the 808 has a badge and the 707 doesn't - I don't know! The 870ES and 770ES normally were a 555ESA and 333ESA respectively.

Anyway, very healthy integrated amps: true powerhouses, able to output lots of curent to feed just about any loudspeaker available. The top cover of the 808 is made of the same G-Base material than its base, to dampen vibrations even further. Slightly reminiscent of the venerable TA-8650 V-FET integrated, too. In Japan, said G-Base was available in Japan for the previous F555ESA (aka TA-F870ES) as an optional accessory.
The production models have 7 screws holding that G-Base cover to the normal one below. Apart from all metal/gold-plated speaker connectors, the top-cover and higher feet of the 808, I'm not aware of "real" differences between the 707 and 808 ; they share the same service manual, too.