Everyone says to think outside the box. What about thinking of the box?
The new Tinker Box series transformers are designed with the creative engineer in mind. Each transformer has multiple taps to help choose and tweak the circuit for the best performance.
The matching transformers have multiple ratios tapped that allow a large variety of configurations. This allows one transformer to be used for developing and testing of circuits with just one transformer.
The TBPWR series power transformers have multiple voltage taps for the fine tuning of a power supply circuit. These transformers can be used with a center tap, or one can remove the center tap jumper wire and have two voltage outputs that can supply two different voltages.
Happy designing. ;-)