[Elecraft] K3 Output Power Question

[Bill Miner]

Hello Elecrafters,
 
I would like to know how stable the output power of the 10 watt K3 is when set to true QRP levels.  
 
I'm asking because my K2 power setting is not very accurate when I try to set it to anything much less than 5 watts.
 
Would it be possible to safely drive an external amplifier that requires 1 watt maximum drive?
 
Thanks & 73,
Bill - K6WLM
KX1
K2
K3 (soon!)