• Country
• Great Britain (UK)

• Manufacturer / Brand
• Brown S. G. Ltd.; London

• Year
• 1923–1925

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 91504

Click on the schematic thumbnail to request the schematic as a free document.

• Main principle
• Audio-Amplification; 2 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 4 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 0.3 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Crystal Amplifier - Brown S. G. Ltd.; London

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 13.5 x 5 x 5 inch / 343 x 127 x 127 mm

• Notes
• Mechanical amplifier for driving a loudspeaker from a crystal set, 2 stages plus output transformer, each stage consists of a magnetic reed system plus a differential carbon microphone.

• Net weight (2.2 lb = 1 kg)
• 1.9 kg / 4 lb 3 oz (4.185 lb)

• Source of data
• Radio! Radio!

• Mentioned in
• The Cat's Whisker, Hill, 1978

• Other Models

• Here you find 54 models, 44 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brown S. G. Ltd.; London