John N9JG wrote:
I appreciate your comment and advice. My L-4B is in near mint
condition, and I am leery about making mods to the amplifier,
although I have updated the series HV electrolytics and diodes in the
power supply. My current thinking is to jury-rig a connector by using
tinned #10 copper wire!

You might be in luck - looks like this eBay seller may still have one of
the factory conversion kits available. Try contacting him.

http://cgi.ebay.com/Drake-VOX-connec...QQcmdZViewItem