1942 Two-Tube Broadcast/Shortwave Receiver

1942SepPM1The father-daughter team shown here are putting the finishing touches on the plug-in coils for the two-tube broadcast/shortwave receiver described in the September, 1942, issue of Popular Mechanics.  The set was designed to build upon a one-tube receiver described in the magazine’s July issue.

1942SepPM3

Most of the parts, as well as the chassis, of the earlier set were re-used to make the more complex receiver shown here. The 1Q5GT detector was re-used, and another 1Q5GT was used as audio amplifier. On strong local broadcast stations, the set would provide loudspeaker volume. For weak distant shortwave stations, the set would provide excellent headphone volume. The five homemade plug-in coils would provide the regenerative receiver with coverage from the broadcast band through 20 meters.

Three power supplies were required. A 1.5 volt dry cell was used for the filament voltage, and four flashlight batteries were used for the bias voltage. The B+ was supplied either by a 45 volt battery or a battery eliminator which was also shown.

1942SepPMschematic



Leave a Reply

Your email address will not be published. Required fields are marked *