Pye Cambridge 1101

 

 This rather large radio was made in 1963 and has a set of valves designed for heater series connection because it's for use on so-called universal mains. Most TV sets were also "universal". I suspect the term was valid in the 1930s and 1940s and rarely in the early 1950s but, because DC mains was long gone by the time this set was manufactured, the elimination of the cost of a mains transformer made universal sets more profitable.

There are no less than seven shortwave bands as well as the usual long and medium wavebands. This was in those days of exotic reception with most stations having their own musical jingle.

 
  You'll notice the set has a two-pin mains connector which meant that its reversal would make the chassis sit at 240 volts above earth. In fact the back appears to be shaped to prevent reversal of the plug, but what about the other end of the mains cable? Many households used a bayonet adaptor plugged into a two way ceiling adaptor or a two-pin mains socket and those who had a three-pin round connector probably wouldn't check which wire was connected to the chassis anyway. The fact that the pins are not marked plus/minus meant that even if you did have DC mains would have resulted in confusion. I suppose the "Instructions" mentioned on the rear cover might have explained everything?

 
 The valves are from left to right: UCH41 frequency changer, behind the IF can a UF41 IF amplifier, a UBC41 detector/AVC and audio amplifier, a UL41 output stage and a half-wave diode rectifier, UY41. These are all B8A based valves with a common heater current of 200mA connected in series to trhe mains via a ballast resistor. Because the set is designed for 100 to 250 volts this ballast resistor has several tapping points selected by the plug-in switch arrangement below the pair of fuses. Two fuses so that if the chassis was earthed one would be garanteed to blow no matter which way round the mains was wired..

 

 
 There are two license plates.. this one is nailed to the inside of the case.

 
 A graphic almost showing how to wire up the aerial, earth and gram pick-up. OK if the set was in the kitchen or, god forbid the bathroom, it's easy to connect to a tap, otherwise how would you do this?
 

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