• Country
• Switzerland

• Manufacturer / Brand
• Sondyna AG; Zürich-Effretikon

• Year
• 1939/1940

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 13582

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

• Number of Tubes
• 7

• Valves / Tubes
• EF13 ECH11 EBF11 EF11 EM4 EL6 AZ4

• Main principle
• Superhet with RF-stage; ZF/IF 472 kHz

• Tuned circuits
• 7 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 25 cm = 9.8 inch

• Material
• Wooden case

• from Radiomuseum.org
• Model: Stradivari 40 EF70 - Sondyna AG; Zürich-Effretikon

• Price in first year of sale
• 495.00 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