3CX1200Z7 Transmission Tube The 3CX1200Z7/YU181 is a(n) triode manufactured by CPI-Eimac. The 3CX1200Z7/YU181 is primarily used in broadcast applications. CPI-Eimac is a leading manufacturer of power grid tubes covering a wide range of applications including broadcast, industrial and scientific. Richardson Electronics is proud to be the exclusive global distibutor for CPI-Eimac products. Contact Richardson Electronics today for more informatio . . .