938AS

• Country
• Czechoslovakia

• Manufacturer / Brand
• Philips akc. spol., Praha-Hloubetin

• Year
• 1933/1934 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 81415

• Picture
• Schematics

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

• Number of Tubes
• 4

• Valves / Tubes
• E438 E438 C453 1823

• Main principle
• TRF with regeneration; 2 AF stage(s)

• Tuned circuits
• 1 AM circuit(s)

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

• Power type and voltage
• Alternating Current supply (AC) / 110-245 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 17 cm = 6.7 inch

• Power out
• 2.8 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 938AS - Philips akc. spol., Praha-

• Shape
• Tablemodel, low profile (big size).

• Notes
• Reaction coils with fixed position; feedback regulated by C13.
  Grid Detection done by first tube E438. 
  LW, BC and SW are divided in 6 ranges:

  • I. 15-33 m.
  • II. 32-90 m.
  • III. 85-200 m.
  • IV. 200-400 m.
  • V. 400-950 m.
  • VI. 950-2000 m.

  The first tube (E438) is shielded to neutralize the magnetic field of the loudspeaker.

• External source of data
• Service Dokumentation

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Ernst Röggla. See "Data change" for further contributors.

• Other Models

• Here you find 162 models, 137 with images and 124 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philips akc. spol., Praha-Hloubetin