> (A, AA, AAA, C, D (why no B) No B now because very few people use battery powered vacuum tubes any more. B batteries were mainly used for vacuum tube plate v

> (A, AA, AAA, C, D (why no B) No B now because very few people use battery powered vacuum tubes any more. B batteries were mainly used for vacuum tube plate voltage. I remember in the early '70s as a kid building a Radio Shack one tube radio kit [1] and using a Radio Shack 22.5 V B battery [2]. I think that was the last time I ever encountered a B battery. By the '70s tubes were on the way out in consumer electronics. On that page I linked with the Radio Shack kits there are 6 radios and only one of them uses a tube. [1] http://my.core.com/~sparktron/pbox.html http://my.core.com/~sparktron/pbox.html [2] https://www.radioshackcatalogs.com/flipbook/1970_radioshack_catalog.html?fb3d-page=126 https://www.radioshackcatalogs.com/flipbook/1970_radioshack_...