Please contact the contributing institution for more information regarding the copyright status of this object.
Description
Unmarked gridless triode prototype by Heintz & Kaufman, likely produced in 1929 in South San Francisco for their Dollaradio contract. "10A 68V" is written on glass. In order not to infringe on de Forest patents held by RCA for the grid, getter, internal insulators and the Western Electric patent for the filament material, Ralph Heintz redesigned the Simpson vacuun tubes held by Dollaradio. The result was the "gridless gammatron," an electrostatically controlled tube without the now-conventional control grid.
Type
image
Identifier
E2EFFEB2-A9FB-4DDF-B0A4-181545873800 2003-1-1995
Subject
Gammatrons Heintz and Kaufman Vacuum-tubes--Manufactures (LCSH) Triodes (LCSH)
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.
