I have had my IC751A for some years now, but I'm not very active on the shortwavebands and I therefore haven't made much with it as with my FT225RD.
I have an indoor-antenna and with this it's possible to have some QSOs, but it's not a very good antenna solution.
Some hints for maintenance are found here.
I also recommend a visit on the Yahoo-groups were there is a group discussing the IC751.