• Country
• United States of America (USA)

• Manufacturer / Brand
• Sears, Roebuck & Co.; Chicago (IL)

• Year
• 1936/1937

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 56250

• • Brand: Silvertone

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

• Number of Tubes
• 6

• Valves / Tubes
• 1A4 1C6 1A4 230 1B5 1F4

• Main principle
• Superhet with RF-stage; ZF/IF 465 kHz

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• Storage and/or dry batteries / 135 & 2 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6 inch = 15.2 cm

• Power out
• 0.66 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Silvertone 7-Tube Battery Radio Order= 57DM 4425 - Sears, Roebuck & Co.; Chicago

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Dimensions (WHD)
• 18.8 x 19.2 x 14.4 inch / 478 x 488 x 366 mm

• Notes
• The Silvertone model 4425 is the same as model 4424, except this model 4425 is using a 2 Volt "A" storage battery (No. 437) and a plug adaptor instead of the 1N1 automatic battery economizer. For details see schematic. Both models cover broadcast 545 to 1720 kHz, long waves (weather band) 220 to 400 kHz and short waves 5.6 to 17.5 MHz. Long waves are quite unusual for US models.

• Price in first year of sale
• 34.95 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Literature/Schematics (1)
• Riders 7-55, 56

• Literature/Schematics (2)
• The Sears Silvertone Catalogs 1930-1942 (page 97)

• Literature/Schematics (3)
• Sears, Roebuck Catalogs (Silvertone) (# 173, Fall & Winter 1936/37, page 609.)

• Other Models

• Here you find 5479 models, 3211 with images and 4185 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sears, Roebuck & Co.; Chicago (IL)