There is a large quantity of tubes for sale near me, and while it is silly to think I can buy and store them all, I might be interested in buying quantities of *computer-rated* tubes - things like 5749s, 5814As, 6414s, and so forth. Some day, maybe a 709 will come my way with 1000 empty sockets... Anyway, if any of you folks have information or samples of old tube based computing junk (modules, for example, or old unit-record stuff) - could I bother you to tell me what types of tubes were originally installed? I am looking for specific numbers, not just "dual triodes". It would be nice to know which machines used which tubes - for example: Machine Tube(s) Used ----------------------------------- IBM 604 1684, 2032 Thanks a bunch! William Donzelli aw288(a)osfn.org