• Country
• Finland

• Manufacturer / Brand
• Oy Helvar; Helsinki

• Year
• 1953/1954 ?

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 334853

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

• Number of Tubes
• 2

• Valves / Tubes
• EAF42 ECH42

• Main principle
• RF Converter/Adapter (not voltage converter); Super Regenerativ

• Tuned circuits
• 2 FM circuit(s)

• Wave bands
• FM Broadcast Band Only

• Power type and voltage
• Powered by external power supply or a main unit. / AC 6.3 & DC 170 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: FM "Super" Värähdin 534U ULA-värähdin EAV602 - Oy Helvar; Helsinki

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 105 x 100 x 48 mm / 4.1 x 3.9 x 1.9 inch

• Notes

• Helvar was the only Finnish radio manufacturer, which produced some models of pendel (= super regenerativ) type of FM converter in 1951-54. Those could be used like FM-upgrade for some Helvar radio models made earlier as AM only. Helvar also included  this converter already on production line into some radio models, which had options to do this easily. 

  The model 534 was the last of converter types and it was also techically more advanced of their pendel family. Anyhow the life period of pendel converters was very short. Regular FM transmission in Finland started in 1952.

   

• Net weight (2.2 lb = 1 kg)
• 0.2 kg / 0 lb 7 oz (0.441 lb)

• Mentioned in
• -- Original-techn. papers.

• Author
• Model page created by Ake Nyholm. See "Data change" for further contributors.

• Other Models

• Here you find 254 models, 215 with images and 93 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Oy Helvar; Helsinki