9.3 Tube Change
Tube changes are only to be undertaken by authorized service
personnel. If power tubes with different values then the original
ones are to be installed, then the amplifier must be re-biased before
operation can be resumed. The amplifier uses a three circuit bias
system. It is quick and easy to accomplish biasing, but involves
removing the chassis and use of specialized equipment for
measuring currents inside the amplifier. Only trained professionals
should attempt this procedure.
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