Revox A77 Auto reverse version modification parts kit

Further Information: 

Very rare!

Revox A77 Auto reverse version modification parts kit. It will be auto reverse Master tape player.

Included:

auto reverse control board,

second reverse play special head (upside down version, place instead of recording head),

one repr. amplifier board,

connecting wires and new sealed volume potentiometer.

No schematic, just photos.