• Country
• United States of America (USA)

• Manufacturer / Brand
• American Transformer Co.; Newark (NJ)

• Year
• 1930 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 32582

• • alternative name: Amertran

• Number of Tubes
• 3

• Valves / Tubes
• 27 26 26

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit.

• from Radiomuseum.org
• Model: Amertran 25-A A Unit - American Transformer Co.;

• Notes
• Low power (driver) amplifier.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Other Models

• Here you find 16 models, 10 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from American Transformer Co.; Newark (NJ)