One of the know problems with the good old IC-730 is a non working preamplifier relay. The relay does switch but no difference in signal level is heard. The problem is dirty contacts in the relay. I found some solutions on the internet. I suppose they work but I did something more simple.
-remove transparent plastic hat of relay. Do it gently it looks like it can break easily
-turn on radio
-turn of preamp
-put some wodka/alcohol on a piece of paper. between the contacts
-turn on preamp
-gently move paper around.
-turn off preamp
-remove paper
-mount plastic hat
I have cleaned it this way 1.5 years ago, the preamp works without problems since.By the way, when using a 2x13 meter dipole antenna the preamp is not needed at all. Not even on 10 meter. When the antenna is connected the noise increases significantly.
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