Low power transformer with 50% Mumetal core for exceptional bandwidth and dynamic range. For use with triode etc. 10k ohms primary and 3 separate secondary windings configurable for 30 to 100, 100 to 250, 250 to 600 ohms headphones. 2.5 W at 50 Hz. Must be ac coupled to prevent dc in primary. Size “A” with colour coded leads or PCB pins.