Hello, I've recently acquired an R-390A and SP-600 JX-14. I'm looking for a rack mounted SSB converter to work with these radios. I know the Hammarlund SPC-10 was made for the SP-600's and the CV-591A was made for the R-390A's. Please let me know if you have one of these (or similar) you're wanting to part with. Thanks, -Mike AA2W