• Country
• United States of America (USA)

• Manufacturer / Brand
• General Television and Radio Corp.; Chicago, IL

• Year
• 1946/1947

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 42923

• • Brand: General

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

• Number of Tubes
• 4

• Valves / Tubes
• 1LA6 1LN5 1LH4 3LF4

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 1,5 & 90 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: 21A4 - General Television and Radio

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes
• The General Television model 21A4 is an Battery Operated Portable Superheterodyne Receiver - Self Contained Loop Antenna.

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios 4. Edition

• Circuit diagram reference
• Rider's Perpetual, Volume 18 = 1949 and before

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date: Jan 1947, Set 12, Folder 472-14)

• Other Models

• Here you find 106 models, 46 with images and 70 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Television and Radio Corp.; Chicago, IL