Futaba risponde
"Thank you for your recent e-mail.
This is a very old 5FGK radio, we have the manual online, but of course we haven't had parts for this in over 20 years. This was made from 1983 to 1988.
Futaba® Product Manuals
Should you have any further questions or concerns, please do not hesitate to contact us at this email address. Please be sure to copy all previous emails into any future questions. You can also reach our product support technical team at 217-398-8970, or via fax at 217-398-7721. "