I need the part no7301-799 which is SW mixer stage. Kindly any one who can help will be given proper prices. The nice radio is dead for ever otherwise.

I don't know how many copies of this model were made, but it's old enough that I suspect you are going to have a tough time finding a decent replacement part. It might be helpful to surf eBay for a donor set to get the part(s) that you need to repair your radio.

Many times I've looked for a junk set to repair one on my bench, only to find that the "junk set" is actually in much better shape than the I'm trying to fix, and the optimum solution is to use the original set to fix the newly-acquired "junker", instead of the other way around.

I think that, like automobiles, some individual radios were "lemons" and that you need to cut your losses if the opportunity presents itself. Of course, if the radio has considerable sentimental value, all such observations fly out the window.