I took a close look inside the ART-13. I need the Audio Amplifier Unit and the 837 VFO. If anybody has spares of these two they would be willing to part with, please contact me off list MkDorney at aol.com . Thanks. 73 Mark D. WW2RDO “In matters of style, float with the current. In matters of Principle, stand like a rock. “. - Thomas Jefferson Sent from my iPhone