Details
S.G.Brown Amplifiers:
a Crystal Amplifier, in rectangular mahogany case with instructions in lid -- 12in. (32cm.) wide; and a Microphone Amplifier, in two-tier case with brass plaque on front, BBC transfer and wiring diagram in lid -- 6in. (16cm.) wide (2)
a Crystal Amplifier, in rectangular mahogany case with instructions in lid -- 12in. (32cm.) wide; and a Microphone Amplifier, in two-tier case with brass plaque on front, BBC transfer and wiring diagram in lid -- 6in. (16cm.) wide (2)