P5A

Roberts Radio Co.Ltd., East Molesey, Surrey, UK

Datos
Foro
Imágenes
Colecciones

  • Año
  • 1946
  • Categoría
  • Radio - o Sintonizador pasado WW2
  • Radiomuseum.org ID
  • 84020

Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

 Especificaciones técnicas

  • Numero de valvulas
  • 5
  • Principio principal
  • Superheterodino en general; ZF/IF 467 kHz
  • Gama de ondas
  • OM, OL y OC
  • Tensión de funcionamiento
  • Red: Corriente alterna (CA, Inglés = AC) / 200-250 Volt
  • Altavoz
  • Altavoz dinámico (de imán permanente) / Ø 15 cm = 5.9 inch
  • Material
  • Cuero/Tela/ Plástico sobre otros materiales
  • de Radiomuseum.org
  • Modelo: P5A - Roberts Radio Co.Ltd., East
  • Forma
  • Sobremesa apaisado (tamaño grande).
  • Ancho, altura, profundidad
  • 300 x 290 x 210 mm / 11.8 x 11.4 x 8.3 inch
  • Anotaciones
  • Tragbar mit Drehteller.
    The P5A radio was released April 1946 Price £16 16s 0d + £3 12s 3d purchase tax.
  • Mencionado en
  • The Wireless and Electrical Trader August 23rd1947

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As I usually do, when repairing vintage radios, I replaced a large number of waxed paper capacitors in this P5A with modern LCR or similar, axial capacitors of the nearest available value, e.g. replacing an 0.05uf 350v paper capacitor with an 0.047uf 400 or 630v. type.  Because the Rectifier valve heater was open circuit and the reservoir & smooting capacitors were leaky, I replaced the former with a !n4007 silicon diode and series resistor, wired across the valve base, leaving the valve in situ to preseve tha above chassis appearance.  I also replaced some burnt resistors, and the smoothing choke, which was open circuit, using a choke salvaged from a scrapped radio.  For the reservoir & smoothing capacitors I used two axial eklectrolytic capacitors mounted on the chassis underside, wired directly to the rectifier output and smoothing choke respectively.  Some of these items should be visible in my photographs.

After completing the repair, and cleaning the dial, knobs ,etc., the radio was tested and run for many hours, working perfectly.  Here in Oxfordshire I was able to receive some 6 or 7 MW stations at good strength, plus BBC R4 on LW at good strength, using the internal Frame aerial only.

Michael Goscombe † 1.8.20, 15.Mar.15

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