ELY07V552L miniature mono cathode ray tube. A long, long, long time ago in a galaxy far away... colour lcd displays had not been invented yet, so if you had the latest in VHS or even SVHS video cameras you would have probably looked through a small eyepiece at the black and white image produced by a small CRT. This is such a CRT, as used in Cannon (EH850Hi) and probably many more generic video cameras of the time, hardly suprising the battery packs the size of a house brick only lasted a few minutes. Listed here as it may be of some use to someone, somewhere, in that far off galaxy ....well East Anglia anyway. Come on folks , where is your sense of humor ! just buy it and put it with all those other obect d'art in the workshop, we will even throw in the base socket and EHT transformer pictured ! "she was only the electricians daughter but nobody could resistor....." no that is a bad joke. dims: 82mm long inc base socket , main body about 20mm diameter, front mounting flange 25mm diameter. status: unknown, but certainly not going to be RoHS compliant. sold as novelty/ educational/ experimenters item only.