• Country
• Italy

• Manufacturer / Brand
• Unda Radio; Como, Dobbiaco

• Year
• 1938/1939

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 30788

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

• Number of Tubes
• 5

• Valves / Tubes
• 6A8 6K7 6Q7 6L6 80

• Main principle
• Superheterodyne (common); ZF/IF 450 kHz

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and 2 x Short Wave.

• Details
• Visual Tuning Indicator pre Eye

• Power type and voltage
• Alternating Current supply (AC)

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Power out
• 5.5 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Quadri Unda 539 [SM] - Unda Radio; Como, Dobbiaco

• Shape
• Tablemodel, low profile (big size).

• Notes

• Differisce dal simile mod. 539 Triunda per avere 5 manopole e 4 gamme d'onda. Soprammobile.
  Indicatore ottico di sintonia. Controllo di tono. Ingresso Pick-Up.
  Tuning meter.

• Source of data
• Guida Pratica Antique Radio II (2000)

• Literature/Schematics (1)
• Il Radio Libro (E.D. Ravalico) Edizioni Hoepli

• Literature/Schematics (2)
• Schemario di apparecchi radio a valvole (II edizione, D.E. Ravalico - Hoepli - 1945)

• Author
• Model page created by Alessandro De Poi. See "Data change" for further contributors.

• Other Models

• Here you find 242 models, 160 with images and 177 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Unda Radio; Como, Dobbiaco