• Country
• Germany

• Manufacturer / Brand
• Ontra - Werkstätten; Berlin

• Year
• 1938 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 117880

• Number of Tubes
• 4

• Valves / Tubes
• AC2 AC2 AB2 AZ1

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Alternating Current supply (AC) / 220 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Prüfsender S3 - Ontra - Werkstätten; Berlin

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 500 x 330 x 190 mm / 19.7 x 13 x 7.5 inch

• Notes
• Frequenzbereiche: 150···375 kHz und 500···1680 kHz. AM-Modulation ist intern und extern möglich.

• Net weight (2.2 lb = 1 kg)
• 7 kg / 15 lb 6.7 oz (15.419 lb)

• Price in first year of sale
• 275.00 RM

• Source of data
• - - Data from my own collection

• Author
• Model page created by a member from D. See "Data change" for further contributors.

• Other Models

• Here you find 31 models, 28 with images and 9 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ontra - Werkstätten; Berlin