• Country
• Bulgaria

• Manufacturer / Brand
• Elprom KB (Kliment Voroshilov Works, Slabotokov zavod); Sofia

• Year
• 1950

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 223776

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

• Number of Tubes
• 4

• Valves / Tubes
• UCH21 UCH21 UBL21 UY1

• Main principle
• Superheterodyne (common); ZF/IF 468 kHz

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

• Power type and voltage
• AC/DC-set / 110; 150; 220 Volt

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

• Power out
• 1.5 W (undistorted)

• Material
• Bakelite case

• from Radiomuseum.org
• Model: 504 [AC/DC, 4 Loktal tubes] - Elprom KB Kliment Voroshilov

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Notes
• Wave Bands:
  MW: 520-1600 kHz
  LW: 150-400 kHz
  SW: 5.8-18 MHz

• Mentioned in
• book "Bulgarian Radio Receivers"

• Author
• Model page created by Simeon Nikolov. See "Data change" for further contributors.

• Other Models

• Here you find 66 models, 61 with images and 50 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Elprom KB (Kliment Voroshilov Works, Slabotokov zavod); Sofia