• Country
• Switzerland

• Manufacturer / Brand
• Sondyna AG; Zürich-Effretikon

• Year
• 1938/1939

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 13569

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

• Number of Tubes
• 8

• Valves / Tubes
• EF8 EK3 EF9 EAB1 EM1 EF6 EL6 EZ4 4687

• Main principle
• Superhet with RF-stage; ZF/IF 465 kHz

• Tuned circuits
• 9 AM circuit(s)

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

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

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 22 cm = 8.7 inch

• Material
• Wooden case

• from Radiomuseum.org
• Model: Stradivari 39 EFK99 - Sondyna AG; Zürich-Effretikon

• Notes
• +4687

• Price in first year of sale
• 490.00 SFr

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Circuit diagram reference
• Thali-Schemasammlung und Tungsram-Röhrenbestückung.

• Picture reference
• Das Modell ist im «Radiokatalog» (Erb) abgebildet.

• Other Models

• Here you find 177 models, 112 with images and 115 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sondyna AG; Zürich-Effretikon