Details
Early amplifiers:
a Burndept Ethophone Power amplifer with valve socket, filament rheostat and various terminals on ebonite panel on walnut plinth; and an early Brown Microphone Amplifier, No. 1428, without name, with aluminium fittings and terminals in teak case with detachable upper cover (2)
a Burndept Ethophone Power amplifer with valve socket, filament rheostat and various terminals on ebonite panel on walnut plinth; and an early Brown Microphone Amplifier, No. 1428, without name, with aluminium fittings and terminals in teak case with detachable upper cover (2)