Wireless Set Canadian No 52

 As you can see from the picture below this receiver was made in Canada during WW2.

 

 

  I've never had one of these sets before. The upper panel is fitted with Zeus fasteners allowing the panel to be detached for access to the valves, which appear to be plentiful in number.

There's no case so maybe this example originally came from a complete set-up including power supply and transmitter which would have shared a large case?

 

 Below is the block diagram

 

 The thirteen valve line-up (with equivalent codes) is as follows :-

V1A RF Amplifier, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1C Mixer, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1B Conversion oscillator, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1D 1st IF amplifier, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1E 2nd IF amplifier, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V2A Detector and AVC, ARDD1 (10D1, 2D13C, CV1300 or 12Y4G)

V2B Noise limiter, ARDD1 (10D1, 2D13C, CV1300 or 12Y4G)

V1F Heterodyne oscillator, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1G 1st AF amplifier, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V1H 2nd AF amplifier, ARP3 (9D2, 12VPA, CV1321, CV1106, VR106)

V3A Crystal calibrator oscillator, 12SC7 or CV540

V3B Crystal calibrator multivibrator, 12SC7 or CV540

V3C Crystal calibrator harmonic exaggerator, 12SC7 or CV540

The valves are generally 13 volt 200mA heater types designed for use with a 12-volt battery. The ARP3 is variable mu and has a B7 base; the ARDD1 has a B5 base.

The 12SC7 is a double triode metal valve with an International Octal base. This has a 12.6 volt heater taking 150mA

The intermediate frequency (IF) is 420KHz.

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