Tesla List wrote: > Original Poster: "Dale, Martin" <martin.dale-at-ntu.ac.uk> > >STC 19H5 (CV490) Close or equivalent sub: 19H5 (6.5kV, 125mA dc max) filament: 4V 4A > >CV2160 (no other No. available) Close or equivalent sub: ESU77 (40kV 350mA) filament: 4V 12A http://www.duncanamps.simplenet-dot-com/tubedata/tubesearch.html had the info. Kristian Ukkonen.