www.decware.com had a $550 dollar 5wpc one using some Svetlana SV83 tubes last I recalled. Or it can be bridged to 10 watts in monobloc mode and then use 2 amps.
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It would help if you would list the speakers that you have available (and their specs), the size of the room and the other components that you wish to use. For example are you looking for an integrated amp or do you want to try the SET with an already existing preamp? I am all for SET's, but if they are not properly matched to a system (and the room) even a very good unit can be very disappointing.