5U4 tubes

Anyone know what 5U4 tubes are used for? I was digging through my tubes and found them. Funny how things turn up I don't recall ever having.

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kt_8804-03-2008 4:20am

kt_88 OP Details Discussions Posts This discussion Message User 242 posts 04-05-2008 at 06:06am Copy Comment URL Report Comment Edit Delete Thanks Rpf
slates Details Discussions Posts This discussion Message User 35 posts 04-08-2008 at 11:17pm Copy Comment URL Report Comment Edit Delete The 5U4 are used in alot of tube testers.
cmk Details Discussions Posts This discussion Message User 397 posts 04-10-2008 at 03:31am Copy Comment URL Report Comment Edit Delete Look here.