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Three-target all-glass vacuum tube has property and spec. as following:

1. All-glass double-tube co-axial structure, high borosilicate 3.3 glass ;

2. Transmission Ratio of the Outer Glass Tube;

3. Structure: Cu/SS-ALN(H)/SS-ALN(L)/ALN.

4. Sediment method: 3 target magnertron sputtering plating ;