• Country
• Czechoslovakia

• Manufacturer / Brand
• Microphona (Mikrofona), Bratri Knotkove, Praha-Strasnice

• Year
• 1937/1938

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 23112

• • alternative name: Telefony Microfona

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

• Number of Tubes
• 5

• Valves / Tubes
• AK2 AF3 ABC1 AL4 AZ1

• Main principle
• Superheterodyne (common); ZF/IF 125 kHz

• Tuned circuits
• 7 AM circuit(s)

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

• Power type and voltage
• Alternating Current supply (AC) / 110-240 Volt

• Loudspeaker
• Permanent or electro-dynamic (moving coil), system not known yet.

• from Radiomuseum.org
• Model: Mikrofona MK500 - Microphona Mikrofona, Bratri

• Price in first year of sale
• 1,840.00 Kc

• External source of data
• Erb

• Source of data
• Ceskoslovenske prijimace 1933-1945, Baudys 1947

• Other Models

• Here you find 69 models, 52 with images and 45 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Microphona (Mikrofona), Bratri Knotkove, Praha-Strasnice