Sutherland DUO - Manual (Page 3)

The Powers That Be:
The 20/20 uses external, bench-top power supplies. They are cost effective, reliable
and offer good performance. Each supply’s output is extensively filtered and regulated
into one +/- 15 volt source for both of the gain stages.
The Phono Blocks have built in AC power supplies. There is an IEC power inlet on
each chassis to accommodate the user's personal power cord choice. Two completely
separate power sections (each providing isolated +/- 15 volts) are provided for each
channel. One for each of the two gain stages. Each is independently filtered and
regulated to provide the ultimate foundation for the gain stages.
Each DUO has a built in AC power supply. There is an IEC power inlet on each chas-
sis to accommodate the user's personal power cord choice. The shielded power sup-
ply module has one output. That output is split into two branches. One for each of the
two gain stages. Each of those branches is independently filtered and regulated to
provide a substantial foundation for the gain stages.
Circuit board properties:
Circuit board dielectric properties can introduce detail damaging artifacts into the
signal.
The DUO mitigates circuit board dielectric properties using the same approach that has
worked so well in the Phono Blocks. Circuit board thickness is doubled from the stan-
dard 1/16” thickness to 1/8” thickness. Not only is dielectric absorption addressed, but
further advantages are realized with an extremity rigid platform for component mount-
ing. It is the cost-no-object, preferred way to go.