6.4. Tube Replacement
A single 4CX800A (GU74B) high-performance ceramic-metal tetrode manufactured by Svetlana is
employed in the amplifier.
DANGER
Tube replacement is a complex and potentially dangerous operation that involves
adjustment of the plate idling current and is Life-threatening!
For this reason, we recommend this work be carried out only by a trained service
technician.
Contact your ACOM dealer for assistance (see Section 1.2 Owner Assistance).