kbx
Member
This is an "all purpose" transformer box I made for the studio to deal with things like hum, impedance matching, polarity, interfacing balanced & unbalanced, "coloration," etc. I repurposed an old EICO box and used three different UTC transformers (LS-30, A-20, A-21). Each one has a direct-out and an isolated-out. You can select impedance taps on both the primary & secondary sides for a low ratio step-up or step-down, and each one also has a ground lift and polarity switch. It's come in handy a few times for flipping polarity, and slightly boosting or coloring signal (I've got separate DI boxes made for stuff requiring a higher turns ratio). I'll attach the wiring diagrams. Figured it might be useful to someone.
