[Elecraft] K3 keying Alpha 374A/76A

[Ka9p at aol.com]

Out of an overabundance of caution I thought I'd ask first....
 
My manuals for my old Alphas suggest the amplifier keying line is 20  
something volts DC +, and the K3 manual says I can key way more than that +  DC.
 
So I just wanted to confirm (or learn more):
 
1) I shouldn't worry about any kind of an outboard relay system,  and
 
2) was curious if there is any other advice re delay settings etc.  when 
using the K3 with old Alphas like the 374A and 76A.
 
Thanks for any thoughts.
 
Scott ka9p