Who makes small (pc mount, signal-level) audio transformers these days?
potted or decently varnished open-frame3:1 stepup or so, maybe 60:600 ohms or such
50-100 mW50 Hz-30 KHz, but maybe reduced voltage swing at low frequencies
0.6" cube or less maybe
Under $10 at 100 pieces
This will be used on the output of a multichannel wave/function generator to boost the output from 20 v p-p (opamp levels) to 60 v p-p floating. SSRs will kick in the transformer when it's needed, to simulate VR speed pickups or engine-driven alternators in jet engine test stands.
I looked at Triad and Tamura, and got some near misses. The catalogs (Mouser, Digikey, Allied, Newark) have very little audio stuff these days.