On 4/28/2020 2:47 PM, James Bennett via Elecraft wrote: > connecting a KX3 along with a K3 to a KPA500/KAT500. The diagram had a splitter in use for the key line, as I recall. Yes. I've done that for years with K3 feeding KPA500 and tube amp (first Ten Tec 425, now 87A and KPA1500). I use relays to switch coax ins and outs. 73, Jim K9YC