High power transistor output transformer (Hammond 147R), nominal primary Impedance 48 CT, secondary impedance 4-8-16; DC resistance primary 1.8, secondary resistance sec. 0.8, max. pri. unbal. 0; Freq. resp. + 0 db - 2 db 60-15K; max watts output 10; mtg. type brkt; core size measures 3/4 by 3/4 inches. *For input, driver, output and modulator circuits, silicon steel core, vacuum sealed coils, flexible leads.