I'm wondering if anyone can help me track down a problem with a SW radio
I just bought at a garage sale? It's a Panasonic RF-B300 (portable),
and when I tested it at the garage sale all bands worked fine. But when
I brought it home the MW band would just barely pick up my local station
and nothing else (HF and FM still worked fine). I took the back off to
check for loose wires on the ferrite antenna, but everything looked OK.
In fact, everything inside looked really solidly built on this radio.
I put it back together, and when I turned it on the MW band was
working loud and clear, picking up stations from all over. I turned it
off, but half an hour later the MW was dead again (except for our local
station). I hadn't moved it or bumped it in the time between when it
was working and when it wasn't.

Does anyone have any ideas of what could be wrong? Like I said, the HF
and FM bands work fine, and the MW band can barely pick up my local
station (but nothing else). Here's a link to some info on this receiver:

http://www.dxing.com/rx/rfb300.htm

Thanks,
Dave.