Whirlwind SELECTOR Instrument Switch

The SELECTOR sends one instrument to two amps, or picks between two instruments into one amp, and it does it silently. The optical switching is patented and it is the reason this box has outlasted every mechanical A/B in the shop drawer.

It works as a 2-to-1 or a 1-to-2 switch and can select A, B or both at once. There are three 1/4 inch jacks and a DC jack on the box, and it runs from a 9 V alkaline battery clipped inside, or a DC adapter. Older units use a 3.5 mm tip-positive power jack.