I have for sale or trade a National Radio tube type converter
for 2 meters. This is the "strip" type converter that will simply
plug into a National receiver that is designed to be used with this
unit. I believe that the NC-300 and the NC-303 are both set up to
accept this unit. I do not have a National receiver so I am unable to
check this unit out. It was working and a good performer many years
ago when last used. Has been sitting on the shelf for all these
years. Price is $75 plus UPS.

Bryan W5KFT