Only familiar with Heathkit amps. Driven an SB200 & SB220 with various solid state radios. Ic 730,TS 430,Ft757,IC746. I used an Ampkeyer between the radios& the Heath amps. There are various interfaces. Some radios it's over kill but some need it. It also a safety too. The Heath turns on 120v to key the relay. Lots of new radios use a reed relay or electronic switching. 120v WAY too much for them. $30 is not a big expense compared to fixing a radio or amp. Elecraft says I can key my Ameritron 811h but I use the Ampkeyer interface anyway. Can't be too careful. I saved my Kopeks for a while to get my beautiful K3.I don't want to have to run the back up radio. My opinion is 'better safe than sorry' k9il
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