[Elecraft] K2 driving KPA500 / KAT500

[Dauer, Edward]

 Having used the KPA1500 long enough to be confident that mine has no obvious bugs, I am trying to decide whether to keep my KPA500 / KAT500 or put it up for sale.

One possibility would be to use the 500s with a K2.  I have a K2 with the integral KPA100, and two without.  The K2/100 has an RCA jack for the amp keying line which should make things easy - just connect one end to the KPA100 and the other to the KPA500, yes?  

Using a K2 alone as driver for the KPA500 is the question.  There must be an amplifier keying line somewhere in the K2 circuitry, since it can key a KPA500 in the two-box "twins" configuration; but there is no mechanical output for it.  Anyone done this who can help with ideas?  

What kind of output from the KPA500 is possible with a barefoot K2 driving it?  Anything else I should know before trying this out?

The band data is not a problem in either case, since the KPA500 has a one-dit sensing circuit which will be adequate.  (It also has band selection buttons, of course.)

Tnx, as always, for any advice,

Ted, KN1CBR