This box still bears the 'Gammatron' label. The Gammatron was Heintz and Kaufman's unsucessful attempt to avoid the DeForest patents on the triode in the 1920s, but was long gone by the time this box was made.
This box still bears the 'Gammatron' label. The Gammatron was Heintz and Kaufman's unsucessful attempt to avoid the DeForest patents on the triode in the 1920s, but was long gone by the time this box was made.