View mrf455rev0 datasheet:

MOTOROLA Order this document SEMICONDUCTOR TECHNICAL DATA by MRF455/D The RF Line NPN Silicon MRF455 RF Power Transistor . . . designed for power amplifier applications in industrial, commercial and amateur radio equipment to 30 MHz. • Specified 12.5 Volt, 30 MHz Characteristics — Output Power = 60 Watts 60 W, 30 MHz Minimum Gain = 13 dB RF POWER Efficiency = 55% TRANSISTOR NPN SILICON MATCHING PROCEDURE In the push–pull circuit configuration it is preferred that the transistors are used as matched pairs to obtain optimum performance. The matching procedure used by Motorola consists of measuring hFE at the data sheet conditions and color coding the device to predetermined hFE ranges within the normal hFE limits. A color dot is added to the marking on top of the cap.