ZXY EI-41 Silicon Steel Core Power Transformer with 12V-0-12V 24V AC Output and Pure Copper Wire Winding for Audio Equipment ZXY EI-4120W-5409 110V/220V to 12V-0-12V 24V 250mA Step Down Power Transformer for Speaker ZXY EI‑4120W‑5409 Step‑Down Power Transformer is a reliable EI‑core mains power transformer specially built for speaker and audio‑related electronic equipment. It accepts dual‑range 110V / 220V AC input and delivers multi‑output AC of 12V‑0‑12V and 24V with rated