There are so many neat tubes out there.
One by one, I will add to this list as I go through my collection.
|A miniature tube with a quartz crystal inside. Used in some early color television sets.|
|Rather large mercury switch.|
|An early 6H6 engraved metal tube with a flat top.|
|A tube engraved with the call letters WJAR on the base.|
|A Sylvania type SN4.
Thanks to generous feedback from several viewers, I now know that this tube is a neon filled strobe called a "strobotron", and may also be numbered 1D21 or 631-P1. Following is a link to a very nice website with instructions for a project using this tube. Strobe project
|An RCA JRC927 phototube. Only three pins on the base.|
|A small 7 pin strobe tube used in precision timing equipment.|
|A German made 7 pin phototube tube used in early automated equipment.|| |