[Elecraft] K3, KPA500, KAT500 and 2M brick amp keying

[Mike Sanders]

I have a K3 with built in 2M transverter. The K3 drives the KPA500 and 
KAT500 with the KPAK3AUX. Everything works

fine. I do not have the key line interrupter installed. Reading notes 5 
and 6 on the KPAK3AUX I am a bit confused.

I want to key a 2M brick amplifier with the key out line on the K3. Can 
this be done without the key line interrupter in place?

Or is the interrupter necessary to do this.