Preamp recommendation


Hi Guys
Need your help in choosing a preamp for my system. 
I have Krell KRS200 mono blocks running B&W 800Ds. I have an option for the following preamps. 
CJ ET3
VTL 6.5
Krell KCR HR
I wanted to get a tube preamp but not sure how the Krell monos will work with a tube pre. I am currently using a KCR 3 pre which is starting to have issues. Briefly I had replaced the KCR3 with ML 38s and the ML was no match for the Krell. A lot of the bottom end was missing. So any help would be appreciated. I cannot audition any of the above in my system. 
Sources include a PS Audio DSJ and Clearaudio TT with a Dynavector Cart and an Avid Phono stage. 
Thanks 
srafi

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