Not worth the effort for a radio that at best is not worth over five or ten bucks such as most of the Vanguards or Conquests or worth feeling guilty about if I did sell it for more.
I do have one treasure though in an Airtronics Prism 7 PCM. Yup Airtronics used the Prism moniker even before Hitec and this radio that is just prior to the micro processor controlled radios and while it is a one transmitter one airplane radio it does have almost all the other modern fancys including expotentials and numerous mixs. But it is all controlled by 48 tiny dip switchs and pots under a front door.
John