• Country
• Great Britain (UK)

• Manufacturer / Brand
• Roberts Radio Co.Ltd., East Molesey, Surrey, UK

• Year
• 2008 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 207096

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

• Number of Transistors

• Semiconductors
• BA4424N BA4236 TDA7231

• Main principle
• Superhet with RF-stage

• Wave bands
• Broadcast, Long Wave and FM or UHF.

• Power type and voltage
• Line / Batteries (any type) / 230 / 4 x 1,5 (LR20) Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3 inch = 7.6 cm

• Power out
• 0.8 W (1 W max.)

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: Revival R250 - Roberts Radio Co.Ltd., East

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

• Dimensions (WHD)
• 238 x 155 x 98 mm / 9.4 x 6.1 x 3.9 inch

• Notes

• Bemerkenswert ist, dass dieses Gerät - äußerlich im  Stil der 50er - keine diskreten Halbleiter aufweist. Die gesamte Empfängerschaltung ist mit 3 ICs realisiert:

  1. BA4424N: FM-Signalaufbereitung: HF-Vorverst., Oszillator und Mischer, ZF-Vorverstärker
  2. BA4236L: FM-ZF-Verstärker und Quadratur-Demodulator, AM-Oszillator, -Mischer und ZF-Verstärker, Demodulator und AGC.
  3. TDA7231: NF-Vorverstärker und Endstufe.

  This radio while reminiscent of the 1950s Roberts doesn't actually match any earlier model. The entire receiver circuit is realized with 3 ICs:

  1. BA4424N: FM Signal Processing: RF preamplifier, mixer and oscillator, IF preamplifier.
  2. BA4236L: FM IF amplifier and quadrature demodulator, AM oscillator, mixer and IF amplifier, demodulator and AGC.
  3. TDA7231: AF preamp and power amp.

  The loudspeaker is smaller than 1950s Roberts in a similar cabinet.

   

• Net weight (2.2 lb = 1 kg)
• 1.180 kg / 2 lb 9.6 oz (2.599 lb)

• Price in first year of sale
• 169.00 EUR

• Source of data
• - - Manufacturers Literature

• Author
• Model page created by Jean-noël Delizee. See "Data change" for further contributors.

• Other Models

• Here you find 100 models, 96 with images and 44 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Roberts Radio Co.Ltd., East Molesey, Surrey, UK