A metal tube 1A7 was never existing. Octal- battery tubes were only made as glas types (1A7G, 1A7GT). We list the 1A7 because some schematics list as 1A7.
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Literatura
Essential Characteristics, GE 1973
Taschenbuch zum Röhren-Codex 1948/49
1A7: Internet
Miguel Angel Trujillo-Rodriguez
1A7: Tabu Röhren-Codex, 1948
Anónimo 15 Coleccionista
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Just Qvigstad
1A7: elektron taschenbuch 1952
Heinz Höger
Mas ...