• Country
• Spain

• Manufacturer / Brand
• Promax; Barcelona

• Year
• 1967

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 191879

• Number of Transistors
• 9

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 10700 kHz; 1 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)     5 FM circuit(s)

• Wave bands
• VHF incl. FM and/or UHF (see notes for details)

• Power type and voltage
• Dry Batteries / 4 x 4,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2 inch = 5.1 cm

• Power out
• 0.5 W (unknown quality)

• Material
• Various materials

• from Radiomuseum.org
• Model: Medidor de intensidad de campo SF-721 - Promax; Barcelona

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 315 x 165 x 198 mm / 12.4 x 6.5 x 7.8 inch

• Notes
• Medidor de campo TV analogica y FM

• Net weight (2.2 lb = 1 kg)
• 5 kg / 11 lb 0.2 oz (11.013 lb)

• Price in first year of sale
• 27,265.00 Ptas

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Alberto Sanna-Alonso. See "Data change" for further contributors.

• Other Models

• Here you find 189 models, 171 with images and 69 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Promax; Barcelona