• Country
• United States of America (USA)

• Manufacturer / Brand
• DeWald Radio Mfg. Corp., Pierce Airo Inc.

• Year
• 1939 ?

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 37718

• • Brand: Pierce Airo

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

• Wave bands
• - without

• Power type and voltage
• Direct Current supply (DC)

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: A Phono Converter - DeWald Radio Mfg. Corp.,

• Notes
• This converter is used with radio and phonograph combination. The purpose of the unit is to enable the phonograph motor to operate on direct current.
  Can remain inoperative on AC mains, provided the slide button switch is in position AC (which disconnects the converter completely from mains).

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 10 = 1939 and before

• Other Models

• Here you find 443 models, 195 with images and 344 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from DeWald Radio Mfg. Corp., Pierce Airo Inc.