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RE: Applications for UTC A-series transformers?

A-11 is Lo-Z to Hi-Z. Secondary is 50K Ohms, primary can be configured for 50, 200 or 500 Ohms. They are useful to connect LO-Z mics into a tube preamp.

I don't know what A-19 is.

A-20 and A-21 are line transformers, useful for converting unbalanced sources to balanced, and vice-versa. You can use them to break ground loops by floating the ground on the secondary. Also, because both the primaries and secondaries have multiple impedance taps, they can be configured for some voltage step-up or step-down for level matching.

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