HiFi / stereo amps made by Dynacord are ultra rare and I think the ST3 is
the rarest one.
The optical appeareance of this amp reminds on the Dynacord ST6 and Telewatt
V120 or V117 mono tube amps (both EL84 push-pull), but with the cabinet laid
Simple circuit. Just using a pair of ECL82 as driver / output tubes. The
last two pictures show the version designed for radio consoles.