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Soviet 6F7 (6Ф7) is an old and quite scarce triode-pentode tube. It is basically a soviet version of the western types 6F7, VT-70 and CV1915, but it is not a direct replacement. Soviet 6F7 has an octal base (K8A) and the western types do have the UX7 (U7A) base. All of the available pieces are new old stock and tested with RoeTest V10. Year of production: 1961 (please look at the gallery pictures).