PR-56A - Russian clandestine/spy receiver - receiving broadcast stations in the 49 m band 

The Russian PR-56A receiver was part of the RION radio set, but was also used on its own. Here you can see the stand-alone version mounted in a special metal frame in a suitcase.
At the beginning of the video, the heater voltage (green mark) and anode voltage (red mark) are checked. The heater voltage should be 1,2 V and the anode voltage 80 V. In the video, the PR-56A receiver is supplied with 1,2 V from a power supply unit and 70 V from several 9 V batteries. This means that the anode voltage is slightly too low, but the receiver works perfectly.
The video shows slow tuning over the 49 m radio band. Many European radio stations can be heard.
Current consumption:
- 1,2 V: 500 mA
- 70 V: 15 mA
The PR-56A receiver is normally operated with headphones. For the video, an active loudspeaker was connected for demonstration purposes.
date: 5th July 2024
time: 20:00 UTC
Links:
PR-56A clandestine receiver: www.cryptomuse...
RION spy radio set: www.cryptomuse...