Rare is the owner of‘ the Drake TR-4 who has nut wasted a lot of time troubleshooting his sicking only to find that the TCVR/RCVR switch on the left side has been accidentally moved. The author solved the problem by making a simple lock which is held in place by some of the chassis screws near the switch. It was made from a discarded ice tray section but any piece of flat stock will do. Cut a notch the exact size of the small protuberance with a nibbling tool or a saw. Secure the lock to the rig with the chassis screw and the job is done. - Dumas M. Robinson - WA6SBP

Click to enlarge