CES 2007 On The Other Hand Wes Phillips & Jon Iverson Jan 08, 2007 If $250 per tube seems too dear, you can supply your own 12AX7, ECC 83, E83CC, 7025, 5751, 7058, 7729, 6681, CV492, CV8156, or 6057—and add Cool Valve's Eat Cool dampers for $40 each, as seen on the right.. Log in or register to post comments