Philips 170A Receiver

  I have two of these bakelite-cased sets, both dating from 1946 and providing long, medium and shortwave reception.


 The set uses a standard range of Mullard valves with 6.3 volt heaters with International Octal bases, because of course, Philips and Mullard are part of the same group. There's an EF39 RF amplifier in front of the frequency changer and allows the set to operate from a built-in aerial. Behind this is the ECH35 mixer/oscillator and to its right the IF amp, another EF39. The empty valveholder should be fitted with an EBL31 which is slightly unusual, but merely has the pair of diodes usually found in an audio amplifier valve. Adjacent to the tuning dial is a magic eye, type EM34 and to the right the rectifier, an AZ31. The mains transformer looks petty substantial and the set has a mains cable fitted with a socket so that some thought is necessary before removing the back.


 Quite a nice dial whose pointer is operated by a Bowden cable, the usual method employed by Philips. Most receivers tune frequencies from low to high and left to right, but this model is the opposite having the highest frequency of each waveband on the left.



 Here's the set's labels. The /15 is the Philips code for the UK and you'll note the usual dire warning about undercutting the manufacturers' "recommended" price, proof of Mr Marconi's stealth tax and the reminder about picking up a license to use the set if you didn't already have such a thing.

The chassis is stamped with the frequency to which the IF coils should be tuned. I've not seen this useful feature before.




 Philips 170A circuit diagram. Click it to see the Trader Sheet.


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