Here is a link to a Rogers 89RS spray shielded tube.
https://www.radiomuseum.org/tubes/tube_89rs.html
Here are pictures of my Rogers 6G7S tube which was the direct substitute for the 89rs. Also there are pics of service manual notes for the Rogers R-371 radio chassis. The 6G7S tube was used in production as of Oct, 1, 1934. It is a 7 pin pre-octal tube.
Bob
Additional info: Rogers got a US patent for a machine used to spray shield tubes. Here is the link.
https://www.google.com/patents/US1981149
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This reply was modified 7 months, 2 weeks ago by
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