The 140 series of low level input audio transformer, voice coil to single grid; alloy core, heavy drawn steel case, insulated leads, low hum pick-up (Hammond 140A), 140 series; primary impedance 4, secondary impedance 60000; overall turns ratio primary to secondary 1:122; dimension measures 1 3/16 diameter, 1 inch high, 1 /12 inches cts; 5 inches to 6 inches lead length