I have valve amplification Paul, but at the moment I've been driving my various Tannoys with Monarchy Audio SM-70 and SM-70 Pro, Class A solid state power amplifiers. The little beggars only have 35 watts, but grip the Tannoys very well, giving an extremely clean and sweet sound. I regard the Monarchys as an absolute bargain in sound terms, they offer amazing sound quality at the price and in some ways at any price.