[Electrothaumaturgist]

I had a similar problem when I fired up the 38-1. Everytime I tried to put the RF cover on (with the chassis overturned), the sound would go out. Remove the cover, the reception would come back in. Went so far as to cut patterns of thin rubber and insulated the interior of the RF cavities, just in case there was a short. (Very tight tolerances there). Still had problems. Wound up being a solder connection between the rear of the tuning capacitor and the RF chassis. While your unit may not have the floating RF chassis as mine does, I'm sure it's something as simple as that! Poke around as Terry said, you'll find it!