<I think we'd probably call an OA2 a 'valve' as well, although talking <about 'stabiliser tubes' or 'cold cathode tubes' seems to be common usage <in UK books as well (as is 'stabiliser valves' and 'cold cathode valves'). < <We certainly talk about 'counting tubes' when refering to dekatrons, <trochatrons, etc. Never seen them called 'counting valves'. And CRTs are <certainly 'tubes' over here. Lest we for get the 2d21 tyratron and the larger cousins. Cold cathode triodes mostly replaced with SCRs. Allison