• Country
• Finland

• Manufacturer / Brand
• Hellberg, Helsinki

• Year
• 1948

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 205486

• Number of Tubes
• 4

• Valves / Tubes
• ECH21 ECH21 EBL21 AZ1

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz

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

• Power type and voltage
• Alternating Current supply (AC) / 110; 125; 225; 240 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 inch = 20.3 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: Opera 648V - Hellberg, Helsinki

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 540 x 360 x 245 mm / 21.3 x 14.2 x 9.6 inch

• Notes

• Dial lamps: 2x 6.3 V / 0.3 A.

  "OPERA" reseller was Oy Otto Brandt Ab, Helsinki.

• Author
• Model page created by Timo Rantasaari. See "Data change" for further contributors.

• Other Models

• Here you find 34 models, 30 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hellberg, Helsinki