• Country
• United States of America (USA)

• Manufacturer / Brand
• Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)

• Year
• 1953 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 88421

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

• Number of Tubes
• 4

• Valves / Tubes
• 1R5 1U4 1U5 3S4

• Number of Transistors

• Semiconductors
• Selenium-Rectifier

• 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
• Line / Batteries (any type) / AC/DC 117 V / 2 x 1.5 (3V in series) & 67.5 Volt

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

• from Radiomuseum.org
• Model: 52L2A Ch= HS-357 - Motorola Inc. ex Galvin Mfg.Co

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

• Notes

• There are six models in this series. The later "A" models added a "B" Battery Saver slide switch, located in the upper right corner of the speaker grill.  The two slide switch positions are: left (DISTANCE-HI), and right (LOCAL-LO).  The DISTANCE-HI position increased the "B" battery drain and improved reception for long distance broadcasts.  The original model "B" battery drain was fixed at the later "A" model DISTANCE-HI drain level.

  Model	Chassis	Color	Battery Saver Switch
  52L1	HS-327	Green	NO
  52L2	HS-327	Maroon	NO
  52L3	HS-327	Gray	NO
  52L1A	HS-357	Green	YES
  52L2A	HS-357	Maroon	YES
  52L3A	HS-357	Gray	YES

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 13, 1953

• Author
• Model page created by Walter Wiesmüller † May 2012. See "Data change" for further contributors.

• Other Models

• Here you find 4596 models, 2962 with images and 4095 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)