This is a transformer box built around N.O.S. Triad JO-1 transformers. The switches enable ground lift, and selection between "LO" (1:10) and "HI" (1:20) ratios. Gold RCA contacts, Mogami and / or equivalent wiring.

Feel free to ask with any further questions and I'll answer to the best of my ability. Price includes shipping with full insurance and delivery confirmation.