0281 refers to NJW0281G, which is a low-frequency high-power NPN crystal triode, and NJW0302G consists of power amplifier pairs for various complementary push-pull power amplifiers.
0281 power amplifier tube parameters:
Collector-emitter operating voltage (Vceo) : 250V
Collector-base reverse breakdown voltage (Vcbo) : 250V
Emitter-base reverse breakdown voltage (Vcbo) : 5V
Collector operating current (Ic) : 15A
Collector dissipation power (Pd) : 150W
Magnification (hfe) : 75~150
Characteristic frequency (fT) : 30MHz
Operating temperature (Tj) : -65℃~ 150℃
Storage temperature (Tstg) : -65℃~ 150℃
Encapsulation: To-3P
Parameters of 250 v, 15 a, 150 w, 30 MHZ, 400 pf