[morzh]

My 38-15 (the tabletop one), that has it's antenna pigtail and nothing else connected, even receives shortwave. Even in the basement. I'm with Terry, look for weak tubes. Especially the 6A7 pentagrid, it is known to have weak amplifying section (the oscillator is usually good) to the point of it being 1/4 to 1/5 value listed in the table. It will still work but the sensitivity will be diminished.