• Country
• Italy

• Manufacturer / Brand
• Zenitron; Torino

• Year
• 1952–1955

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 99233

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

• Number of Tubes
• 2

• Valves / Tubes
• DF92 or 1L4 DAF91 or 1S5

• Main principle
• TRF with diode detector

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / 2x 22,5 & 1x 1,5 Volt

• Loudspeaker
• Magnetic loudspeaker (reed) generic. / Ø 5 cm = 2 inch

• Power out
• 0.015 W (unknown quality)

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: Derby RT21 - Zenitron; Torino

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 180 x 55 x 60 mm / 7.1 x 2.2 x 2.4 inch

• Notes

• Apparecchio ricevente in onde Medie da usare come la cornetta telefonica per ascolto personale.

  L'accensione dell'apparecchio avviene estraendo l'antenna.

• Net weight (2.2 lb = 1 kg)
• 0.5 kg / 1 lb 1.6 oz (1.101 lb)

• Mentioned in
• -- Schematic

• Literature/Schematics (1)
• -- Schematic (Il Radio Libro D.E. Ravalico 13a edizione Hoepli editore 1952.)

• Other Models

• Here you find 8 models, 7 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenitron; Torino