Charlie

I assume you have an amp now that you are using.

Whether a Zkit1 will be satisfactory all boils down to how loud you want the system to play.  You would be in the 88-91 db range, 1 meter away from the speakers.  If in doubt at all, I'd spend the $25 on Ebay to buy a spl meter and see if that volume level is loud enough for you (Radio Shack use to sell one, but I think they no longer do).

You could also but two Zkit1's, bridge them, and run dual monoblocks.  This would get you in the 91-94 db range, 1 meter away.  Of coarse, its twice as expensive.

To get optimum power out of the Zkit1 into 10 ohm speakers, a different output transformer should be used.  You will not get 2w out of a Zkit1 into 10 ohm speakers using the suggested output transformer, Edcor GSXE10-6-8k.  I'm no transformer expert, but my best guess would be GSXE10-8-5k.  A call to Steve would be a good idea to confirm this.

My favorite output tube is the Russian 6p15p tube, available on Ebay, 4 for $14.  My favorite input tube is the 6N1P, which you can also get on Ebay for a couple bucks.

Dan