[ARC5] Harvey-Wells AR-3a

[elden meyer]

Good Morning Mike,
You might look at the Airadio model SU-41D light aircraft receiver. 
Information is available at: https://www.radiomuseum.org/r/airadio_su_41d.html  
This also uses 1.4 volt loctal tubes. Gain is controlled by adjusting the screen voltage, and audio filtering by an RC network. 
Elden 



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