2SC2690, NEC Nippon Electric, Silicon NPN High-Voltage Power Transistor, 
Vcbo 120V, Ic 1.2A, Tc 25°C 20W, 170MHz, 
Case type: TO-126, 

Marking: C2690, 
ECB

For Audio an Radio Frequency Power Amplifier. 

Complementary PNP 2SA1220