Sutherland DUO - Manual (Page 5)

PARTS QUALITY
FR-4 fiberglass circuit boards, Double-sided with plated thru holes.
1/8” thick for extra rigidity and minimal dielectric influence.
Dale/Vishay 1% metal film resistors
Wima Polypropylene capacitors for power supply by passing and DC servo
Custom wound, 1% polystyrene film capacitors for equalization
14 gage cold rolled steel base
baked epoxy powder coat finish
1/2 “ thick anodized aluminum panel
anodized in front panel artwork
gold plated, Teflon insulated RCA connectors
gold plated configuration headers and shunts