I am a Tannoy dealer and I am using the Sophia Electric 300B Mono blocks with a deHavilland Mercury 3 preamplifier. Plenty of power and sounds great. There is a pretty good review of the Sophia's by Jeff Day ( http://www.positive-feedback.com/Issue53/sophia300b.htm )... he talks about all the amplifiers he has used with his Tannoy's. Check it out.
Jim
soundsrealaudio.com