Hi Karl, It has been awhile since I have done anything with my L-4B, but as I recall, the VOX line needs to be grounded for the relay to pull in. If you are running a T$-7 or most of the Drake 4 lines, this is easy to do. Otherwise, simply ground the center conductor of the RCA VOX jack on the back of the amp. That should cause the relay to close. You will have to release that ground if you are using the same antenna for receive as for transmit. It is not really necessary to connect the AGC line. Your manual should tell you about these connections. 73 and holiday greetings, John, W4AWM
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