5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

110 or 220 V 1 W Amplifier (CB12873E)
This circuit uses high voltage transistors to provide direct power from the 110 V power grid or a...
Microphone Preamplifier (CB7016E)
This circuit was designed to work with the previous one in triggering a relay by the sounds picked up...
RMS to DC Converter (CB6105E)
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...