Audio Geometry PMA-25

I got two Audio Geometry PMA-25 power amplifiers from a broadcast studio. They are very tiny but packs a punch. I am gobsmacked! Only 8" x 8.5" x 3.5" big. Inside there isnt much - two power transistors, one toriod transf, and a few other components including a sub-mini impedance matching transformer for the input signal.

Their sound is tight and well paced. I like them from the first minute I heard them.

Do you know anything about these amplifiers?

Best regards,
Dewald