I am using a pair of Lyrita audio mono blocs. They are made by a friend in New Delhi, India, where I live. You have probably not heard of them. They use a pair of EL34s. Check them out at www.lyrita-audio.in/ I have ordered thru the Indian dealer a Conrad Johnson CT 5 pre and a CJ L70s. Have read great reviews of the CT5 but the power amp is a new iteration /design of the Premier 140. Just hope the combo works. The lyrita mono blocs sound great but at less than 50wpc into 8 ohms, they lack the juice to drive the Quads.
Best of luck.
Best of luck.