The 30PL13 triode beam tetrode was designed specifically for service in a frame output stage of a 110° deflection television receiver. The earlier version for 90° deflection sets was the 30PL1.
The requirements are low power and low frequency service. As with nearly all later television valves the heater is designed for 300 mA and operation as part of a chain across the mains supply.
The top of the triode is supported on a mica sheet secured part way up the central screen.
The triode: stitched anode, copper grid supports and flat faced cathode with rounded ends.
