I would like to hook a 50 yr old Heathkit HA-14 "Kompact Kilowatt" amplifier to my FLEX 6300. (It's basically the same as the SB-200 but in 2 boxes, using a pair of 572B's.) Have an Ampkeyer intermediate relay box but don't see any comments about using this setup. Thoughts please?
Definitely use the Ampkeyer interface in this case with the old keying circuit. Be aware that one of he differences with the HA-14 is that the output is basically fixed at 50 ohms, there is no loading control.