Sony's last stand for 2-channel audio... with multi-channel waiting in the wings.
Unlike what was touted, the Fixed Pickup Mechanism wasn't anything new as it it was used in Sony's original CDP-5000S professional CD player in... 1982 !
The SACD format on the other hand was new in 1999, even if chances are it'll never have the widespread success of its father (CD) or grand-father (LP).
Sound-wise an audible upgrade from the last of the X7 Series thanks to the complex-but-simpler S-TACT digital-to-analogue scheme... and the 5-position VC24 24bit filter.
The differences between the 25kg SCD-777ES and the 26,5kg SCD-1 are the looks, a pair of balanced outputs and a sealed transformer added for the SCD-1 ; the rest is the same, including KHS-18 frame and KSS-180A pickup, digital and analogue sections.
As for all very popular hi-fi components, after-market mods abound and the internet is full of them : easy, cheap, high-end and ultra-high-expensive-end.
The initial production run for the SCD-777ES and TA-FA777ES was planned at 700 units per month.
I have no idea how many units were actually produced, but the SCD-777ES sold well, very well.
Available in black fashion in the USA, champagne elsewhere.
Accuphase naturally used the same drive for its own DP-100 SACD drive.
An april 2000 review, here.