Pye 9 inch Television 1950
This is a 9" Television receiver manufactured by PYE Radio and Television that were based in Cambridge here in Great Britain. This receiver was their second model to employ line flyback EHT [high voltage] thus dispensing with the very heavy, expensive and difficult to manufacture mains transformer. The LV30's valve heaters were wired in series with the cathode ray tube rather like a string of Christmas tree lights. The surplus current was taken care of with a wire wound dropping resistor wired in series with the 'chain'. The LV30 wouls operate on AC or DC mains supplies. Many of Britains large towns were still served by DC mains as late as the early 1960's. This receiver uses the new B9A 'Noval' valves that were introduced in 1950 to cater for the mass market demand for reasonably inexpensive Television receivers. The RF strip that amplifies the sound and vision signals uses EF80 valves and the timebases and sound output stages, ECL80's. The line output valve is a PL38 and finally the HT rectifier is one half of a PZ30, the remaining half functioning as a boost diode. [Reclaim rectifier] The set is stagger tuned to the old Alexandra Palace transmitter frequencies, 45mc/s vision, 41.5mc/s sound. A Birmingham [midlands] version was also available [BV30] to cater for Britains second television station opened less than a year earlier at Sutton Coldfield on channel 4. The Mullard picture tube is a MW22-16 is fitted with an ion trap magnet to prevent 'ion burns' that caused a ...
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