A-501 Harp

• Country
• United States of America (USA)

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

• Year
• 1946

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 37720

• • Brand: Pierce Airo

• Picture
• Schematics

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

• Number of Tubes
• 5

• Valves / Tubes
• 12SA7 or 12BE6 12SK7 or 12BA6 12SQ7 or 12AT6 50L6 or 50B5 35Z5 or 35W4

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 105 - 125 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm

• Material
• Catalin (a brand name for a thermosetting polymer popular in the 1930s and 1940s - a phenol formaldehyde resin - like Bakelite, but a two-stage process with a lot of work afterwards).

• from Radiomuseum.org
• Model: A-501 Harp - DeWald Radio Mfg. Corp.,

• Shape
• Design Radio or Novelty / Gadget - fancy or unusual shape.

• Dimensions (WHD)
• 9.75 x 6.25 x 5.5 inch / 248 x 159 x 140 mm

• Notes
• DeWald on the dial, not on the case. There is a prewar model, too: 501A, which uses partly miniature tubes.
  Colors: brown-yellow, red-yellow or yellow.

• Net weight (2.2 lb = 1 kg)
• 2.520 kg / 5 lb 8.8 oz (5.551 lb)

• External source of data
• Ernst Erb

• Source of data
• Table Top Radios Vol. 1 Stein 98

• Circuit diagram reference
• Rider's Perpetual, Volume 15 = 1947 and before

• Mentioned in
• Collector's Guide to Antique Radios 4. Edition (Beitman Radio Diagrams 1949)

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 9-46, Folder 464-22)

• Literature/Schematics (2)
• Plastic Radios - The Antique Radio Collectors' Source Book

• Other Models

• Here you find 442 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.