(2 PCS) RCA1C12 Power NPN Transistors 40W 4MHz 150C audio linear amplifier NEW $15 SUPER RARE!!!! P · 40W ; f · 4MHz ; T · 150C ; the RCA1C12 is a silicon NPN transistor preferred for use in audio and linear amplifier applications .Transistors RCA1C03 RCA1C12 RCA1C04 RCA1C13 Silicon Transistors for Audio-Frequency Linear-Amplifier Applications JEOEC TO-220AB N-P-N and RCA1C03 RCA1C12 P-N-P Complementary Types RCA1C04 RCA1C13 RCA1C03, RCA1C04, RCA1C12, and RCA1C13 are complementary silicon n·p-n and p-n-p transistors especially characterized for audio-amplifier applications. These devices, singly or in pairs in complementary- or quasi-complementarysymmetry circuits, are particularly useful as drivers or.