[Elecraft] TS520S and KPA500/KAT500

[Nr4c]

I want to use a Kenwood 520S with my KPA500 amp. I have the cable from the 520 Remote connector to amp PTT IN. 

I assume I should tune up radio with dummy load and then turn Drive down low and switch amp to Operate. Now turn up drive to get desire amp output. 

Now I ask, “What have I forgotten (or never knew about tube radios))?”  Anything else I need to pay attention to or what am I missing?

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...nr4c. bill