abbasaudio SPDIF output tube stage, 6S6B for CD player upgrade

Description

SPDIF OUT tube stage with
the 6C6B cathode follower.
Stage has a
high input
and
low output
impedance
.There are two
outputs terminals:
1:1
transformer
and
through the capacitor
.
spdif out circuit with 74HC74 is a  typical solution
but the tube
sound is
warmer and softer
PC board requires
:
AC
9-
12v,5ma
plate voltage
and
AC
6v,200ma
filament voltage