| used for 7-pin vacuum tubes such as 6C33, FU-29, 829B, etc. Its pins, the diameter of which is Ф3.2mm(5) and Ф4.0mm(2) respectively, are distributed in a cycle which diameter is Ф21.70mm. |
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| Usage Descriptions︰ | 6C33、829B、3C33、3E29、832A、5894、FU-29 |
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