Hi Folks, Talking to my man in the local surplus store, I discovered he has the following valves. Can those with access to the appropriate documentation let me know if any would be of use for a tube-coil CV2520 KB/P 1 of, a large beast with additional markings 5C22/NC CV2210 KB/D 2 of, believes these are audio dW0 R6J English Electric Valve Co. 8503 6711 Many Thanks Mark