Use and Maintenance
Tubes
The 4CX800A/GU74b tubes used in the ALPHA 99 are very rugged and normally
operate with a large margin of safety. They should provide outstanding service for
many years if not damaged by abuse - especially overdrive or blockage of cooling
airflow. Allow at least twelve inches (31 cm) unobstructed clearance around the air
intake and exhaust areas. Stacking equipment is not recommended.
Never allow key-down plate current to exceed 1.5 amperes for more than one or two
seconds. If you do and a plate current trip occurs, it will automatically reset in about 4
seconds if the amplifier is returned to receive (key-up).
Never allow the red GRID LED to stay brightly illuminated for more than a second.
Frequent on-off AC power cycling may shorten tube life. It’s better to leave
equipment in standby for several hours than to cycle power repeatedly on-off-on-off
over the same period.
Interlocks
The ALPHA 99 is equipped with a cover interlock switch intended to remove primary
power from the amplifier, and a crowbar to short-circuit the high voltage to chassis
whenever the cover is lifted. These interlocks are designed to protect against
dangerous electric shock resulting from accidental contact with the lethal voltages
inside the amplifier.
WARNING!
ALWAYS DISCONNECT THE AC LINE CORD FROM THE POWER
SOURCE BEFORE REMOVING THE TOP COVER FROM THE 99 FOR
ANY REASON!
Sectio
6
Radio Alpha Products Inc. ® Alpha 99
30
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