Time for a new tube system.

I recently tried out the ZOTL 40's. I wasn't sold.

@rothwea, matching speakers with amps is critical and not every pairing works.  What speakers did you try with the ZOTL40s? 

Easy to drive 8 ohm Devores

B&Ws are traditionally not tube-friendly speakers. IME, a fair bit of performance of the tube equipment in use in this system already is left on the table on account of the speakers being harder to drive.

When shopping for speakers, look at what the manufacturer uses. You don't have a lot of power here, so you want a speaker that doesn't need much. Eight ohms would be the least impedance (particularly in the bass region- stay away from speakers that have dual woofers unless you know that the combo of woofers is 8 ohms or more) and the efficiency should be at least 92 db in most rooms (if a small room less efficiency might work). 

^I agree with the gist of Atmasphere's post above.
 I suggest that the OP consider ss amplification for use with B&W's.