• Country
• Czechoslovakia

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

• Year
• 1934/1935

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 135807

• • alternative name: Telefony Microfona

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

• Number of Tubes
• 4

• Valves / Tubes
• RENS1234 AB1 E443H 506

• Main principle
• TRF with diode detector; Reflex

• Tuned circuits
• 2 AM circuit(s)

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

• Power type and voltage
• Alternating Current supply (AC) / 110; 125; 150; 220; 240 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 16 cm = 6.3 inch

• Power out
• 1 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Superdual MK205-II - Microphona Mikrofona, Bratri

• Shape
• Tablemodel, high profile (upright - NOT Cathedral nor decorative).

• Dimensions (WHD)
• 370 x 370 x 260 mm / 14.6 x 14.6 x 10.2 inch

• Notes
• 1)Two Tuned Circuits is only for MW and LW, but only one for SW.
  2)Wooden case with bakelite front mask.

• Net weight (2.2 lb = 1 kg)
• 12 kg / 26 lb 6.9 oz (26.432 lb)

• Literature/Schematics (1)
• - - Data from my own collection

• Author
• Model page created by Josef Smitka. See "Data change" for further contributors.

• 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