This is the 6 pages manual for audio research d 51 schematic.
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audio research
HIGH DEFINITION
SSOO ANNAPOLIS LANE NORTH / PLYMOUTH, MINNESOTA 55447-5447 / PHONE: 768-577-9700 FAX 788-577-0828
D51 POWER AMPLIFIER
SCHEMATICS & CHASSIS/TUBE
LAYOUT
Schematics 1972