Just picked up a set of SF, Cremona Auditor, M but have yet to plug them in. The previous owner used a set of Antique Sound Labs, Monsoon monoblocks (120/60 watts x 2 pentode/triode) with a Aesthetix, Calypso line stage. I'm going to try a Cary, CAD 808R (60/30 watts x 2 pent/tri) & Manley...