How does it Work?

(1) Mixer

(2) IF amp and BFO

(3) Detector

(4) Audio Amp

(5) Power Supply

 

 

Here is the audio amp. I have never seen this design using a 6U8. Nothing special, but that single 6U8 does put out good audio (for a single tube audio amp). As you can see, the audio goes into the triode section through pin #9. It's amplified and coupled through capacitor C19 where it is injected into the control grid of the pentode section through pin #2. It is amplified yet again and exits the plate via pin #6. From there, it goes into the plate transformer from which you have a choice of using the internal speaker or headphones.

Again, nothing special here so let's finish up with the power supply section.

 

(1) Mixer

(2) IF amp and BFO

(3) Detector

(4) Audio Amp

(5) Power Supply

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Complete Schematic for the Conar Model 500 Receiver

Conar Transmitter Manual - and - Conar Receiver Manual