VAC PA90 User Manual
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CAUTION
DO NOT OPERATE THESE UNITS WITHOUT THE GROUND STRAP ATTACHED
BETWEEN EACH AMPLIFIER AND ITS ASSOCIATED POWER SUPPLY.
OPERATION WITHOUT THE GROUND STRAP POSES A POTENTIALLY LETHAL
SITUATION.
THESE UNITS CONTAIN NO USER SERVICEABLE PARTS. DO NOT REMOVE
THE BOTTOM PLATES OR TOP COVERS. LETHAL VOLTAGES ARE PRESENT
WITHIN THE CHASSIS. DO NOT OPERATE THE UNITS IF THEY ARE WET.
VACUUM TUBES BECOME HOT ENOUGH TO CAUSE SERIOUS BURNS. NEVER
TOUCH A TUBE WHEN THE UNIT IS ON. IT MAY TAKE SEVERAL MINUTES FOR
THE TUBES TO COOL DOWN AFTER THE UNIT IS SWITCHED OFF.
INDEX
Introduction
Unpacking
Installation
Operation
Biasing
AC Balance Adjustment
Selection Of Output Stage Operating Mode
Installing New Output Tubes
Replacement of Low Level Tubes
Care Of Chassis
Tips and Advice
A Word About Tubes in General
A Word About Output Tubes
A Word About Low Level Tubes
A Word About Bias Levels
A Word About Impedance Matching
A Word About Output Stage Operating Mode
Specifications