How To Measure "Current" In An Amplifier?

Hello Al,
Your Daedalus speakers are designed to work well with either tube or SS amplifiers. Your VAC REN 70/70 amplifier provides a choice of several  NFB settings  and  zero feedback.  I'm assuming that you have tried the various feedback settings,  which one sounds best with the Daedalus Ulysses?
Thanks, 
Charles,  

Al,
Thanks,  I suspected that zero or minimal NFB would be the preferred setting. 
Charles, 

Hi Gdhal,
Your volume control settings would suggest that you have quite a bit of overall system gain.  By that I mean 90 db SPL at a 9 o'clock V.C.position. 
Charles,