Burkhard Kainka
About the article

Short-Wave Regenerative Receiver

for AM and DRM

Is it possible to make a short-wave regenerative valve receiver so stable that it is even suitable for DRM? And is it possible to do this using a 6-V supply, so only a single voltage is necessary for the filament and anode supply? It looks like it might be possible with an EL95, which has good transconductance even at low anode voltages, although it is actually an output-stage pentode instead of an RF valve. Besides that, it draws only a modest 200 mA of heater current. Everything can be operated from a small battery, which eliminates any problems with 50-Hz hum.
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