Description
Tweaking the two IF transformers secondary windings for maximum audio output. Adjustment carried out from under the chassis of the AWA Radiola 500-MY.
This should normally be done using a signal generator and a suitable meter such as a vacuum tube voltmeter (or similar)
t should be noted that this receiver does NOT employ a separate RF amplifier stage, and as a consequence, the sensitivity on reception is only in the vicinity of 10 to 50 μV. As a comparison, a well designed communications receiver of that era had a much improved sensitivity of around 1 to 5 μV. (microvolts) due to the addition of a separate Radio Frequency Amplifier stage.
If you're located a long distance from the transmitter(s), the poor sensitivity of this receiver will result in ''background noise'' when you attempt to tune in the station....or...you may not even be able to hear the station !
You can see the topside of the chassis including the two IF transformers here https://www.youtube.com/watch?v=N1XA1SIS3ck&t=70s