Jgiacalo is correct on wood tuning feet and tubes. I own a MA2275 ( c2200 pre section in my integrated ) and have already rolled 3 sets of tubes. Yesterday I received a pair of Telefunken ecc 801s and heard the most dramtic change yet to my mac. Felt like the highs came alive with beautiful seperation and tighter. longer lasting decays. I have my system on sistrum sp004's, cutting out rosewood cups and resting the points on the cups also seemed to cut some glare and made my digital sound a little warmer. Tweak is in my virtual systems thread. Experiment and have fun, get those stock tubes out of your c2200.
