SIEMENS D3a / 7721 Black Plate

SIEMENS D3a / 7721 Black Plate
High transconductance long-life > 10.000 hours Frame Grid pentode produced for German Post by Siemens. These are triple mica, rare black plate version with gold pins. Can be used in triode connection as a great driver for 2A3 and 300B tubes.
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