arne thormodsen wrote:

My dad recently gave me a National NC-109 bought at a surplus auction.
It works but has a problem. There is a "dead space" at the bottom of
each band. It's totally silent down there, no scratching, no
whistles, nothing. For example, I can't tune regular AM broadcast
below about 650. As the radio warms up the problem becomes worse,
after an hour I can't tune below about 750. The problem is similar in
all the bands, but less severe in the higher ones.

The tuning capacitor is damaged, probably by someone who tried to fiddle
with the plates to adjust the tuning. It shorts out at the bottom of the
dial. I bet a nickel. Not a dollar, but at least a nickel.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."