• Country
• Switzerland

• Manufacturer / Brand
• Niesen, Constructions électriques et mécaniques (CEM); Neuchâtel

• Year
• 1943–1945

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 12620

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

• Number of Tubes
• 6

• Valves / Tubes
• ECH21 EF22 EF22 EBL1 or EBL21 EM4 AZ21

• Main principle
• Superheterodyne (common); ZF/IF 471 kHz

• Tuned circuits
• 6 AM circuit(s)

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

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

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 20 cm = 7.9 inch

• Power out
• 4.5 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 644 - Niesen, Constructions

• Dimensions (WHD)
• 530 x 350 x 220 mm / 20.9 x 13.8 x 8.7 inch

• Notes
• Lt. Schaltbild EBL21. In Sammlerexemplar (Chassisstempel) und auf der Abbildung aber EBL1, erkennbar an der Gitterkappe (die EBL21 hat keinen Obenanschluss).

• Net weight (2.2 lb = 1 kg)
• 11.7 kg / 25 lb 12.3 oz (25.771 lb)

• Price in first year of sale
• 500.00 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 81 models, 51 with images and 56 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Niesen, Constructions électriques et mécaniques (CEM); Neuchâtel