Descripción |
This tube appears to be one of the earliest Noval (B9A) tubes, registered on November 25, in 1946, in the Electron Tube Registration List, short after the 12AU7, registered on October 18, 1946.
VHF/UHF medium mu dual triode, usable up to 800MHz.
GE, Hytron, Sylvania, Tung-Sol, WE known manufacturers.
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