• Country
• United States of America (USA)

• Manufacturer / Brand
• DeForest Radio Telephone & Telegraph Co. (De Forest); New York

• Year
• 1920

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 186748

• • alternative name: Lee De Forest Mfg.

• Number of Tubes
• 2

• Valves / Tubes
• VT-Class-I or B_Moorhead-Shaw VT-Class-II or A_Moorhead

• Main principle
• TRF with regeneration; 1 AF stage(s)

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

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Commercial Receiver RS-500 - DeForest Radio Telephone &

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

• Dimensions (WHD)
• 590 x 400 x 250 mm / 23.2 x 15.7 x 9.8 inch

• Notes
• The RS-500 Commercial Receiver comprises a panel on the front with all necessary controls. The tuning is done by means of two vernier type condensers mounted on the panel as well as the two knobs at the top of the panel that vary the coupling between the honeycomb coils in the coil mounting in the top of the case. Step by step condensers are furnished for inserting the proper amount of capacity in the grid circuit and across the B battery and telephone, and a variable grid leak is mounted on the face of the panel so that the tuner will work equally well with any type of VT Audion. Wave change by plug-in coils.

• Net weight (2.2 lb = 1 kg)
• 15.5 kg / 34 lb 2.3 oz (34.141 lb)

• Price in first year of sale
• 250.00 $

• Mentioned in
• Radio Manufacturers of the 1920s, Vol 1 (Page 171)

• Literature/Schematics (1)
• De Forest Radio Receiving Apparatus Catalog D page 32-33

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 158 models, 132 with images and 16 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from DeForest Radio Telephone & Telegraph Co. (De Forest); New York