Dual Monaural Power Amplifiers Operating Manual N 333 N 332 N 331

Table of Contents

Unpacking Your Amplifier ........................................................................... 6

Warm up/break-in period ................................................................................. 6

Placement Considerations ......................................................................... 7

Ventilation ........................................................................................................... 7

Operating Voltage, Nº333 ........................................................................... 8

Nº 333 AC mains maximum current requirements.................................... 8

Nº 333 rear-panel label............................................................................... 9

Operating Voltage, Nº332 & Nº331 ............................................................10

Nº 332 AC mains maximum current requirements .................................. 10

Nº 331 AC mains maximum current requirements.................................... 11

Nº 332/331 rear-panel label ....................................................................... 11

Special Design Features ............................................................................12

Massive Power Supply.......................................................................................12

Balanced design...............................................................................................12

True Voltage Source...........................................................................................12

Adaptive Biasing of the Output Stage ........................................................... 13

Extensive Protection.......................................................................................... 13

Front Panel ..................................................................................................15

Rear Panel ..................................................................................................16

Remote turn-on tip polarity ...................................................................... 18

Bridged Operation .................................................................................... 22

Bridging Explained ........................................................................................... 22

Balanced Bridging ........................................................................................... 22

Balanced Bridging Kit ............................................................................... 22

Balanced Bridged Input Connection ..................................................... 23

Single-Ended Bridging...................................................................................... 24

Single-Ended Bridging Kit ......................................................................... 25

Single-Ended Bridged Input Connection................................................ 25

Biamplification .......................................................................................... 27

Balanced Y-adapter ................................................................................. 27

Passive biamping wiring diagram ........................................................... 28

Care & Maintenance ................................................................................ 29

U.S. and Canadian Warranty .................................................................... 30

Obtaining Service ...................................................................................... 31

Specifications ............................................................................................ 32

Dimensions: Nº 333 & Nº332 ..................................................................... 33

Dimensions: Nº 331 .................................................................................... 35