• Country
• United States of America (USA)

• Manufacturer / Brand
• United American Bosch (Magneto Corporation); Springfield (MA)

• Year
• 1934 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 318229

• • alternative name: American Bosch Magneto
  • Brand: Essex

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

• Number of Tubes
• 5

• Valves / Tubes
• 2A7 58 2A6 2A5 80

• Main principle
• Superheterodyne (common); ZF/IF 125 kHz; 2 AF stage(s)

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Alternating Current supply (AC) / 110; 125; 150; 220 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 18.5 cm = 7.3 inch

• Material
• Wooden case

• from Radiomuseum.org
• Model: Vibro-power Ch= 375 - United American Bosch Magneto

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 575 x 340 x 245 mm / 22.6 x 13.4 x 9.6 inch

• Notes

• The circuit design is slightly different from the models 375/475. Specifically there are small differences in the AVC-circuit, AF amplifier bias circuit and front end tuned circuits.

  Majority of the components are assembled on two perforated boards, which may have been preassemled for the production line.

  The receiver has a similar front panel as the American Bosch model 475. However the speaker is not on top of the unit rather than to the right of the controls.

  The chassis is identical to the one in model 375. The case seems to be deeper, so that the chassis rear is about 40 mm behind the rear wall plate.

• Literature/Schematics (1)
• -- Schematic (Reverse engineered)

• Author
• Model page created by Harri Lumme. See "Data change" for further contributors.

• Other Models

• Here you find 414 models, 163 with images and 272 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from United American Bosch (Magneto Corporation); Springfield (MA)