door John Koster

Deze elektrodynamische luidspreker uit 1927 is voorzien van een ingebouwde eindversterker en netvoeding.

With Rice-Kellogg loudspeaker. Single stage amplifier with two LS5A valves in parallel. Models for AC and DC supply are available, the former includes a rectifying system in which the field magnet winding serves as a smoothing choke. Volume and pitch control are fitted.