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 ;

Comparing to Al-N-Al vacuum tube, it has advantages in cold area as following:

a. Absorbance: 12% higher.

b. Emission Ration: 30-49% lower.

c. In alpine area, copper ions emission ration is lower than that of aluminum ion. So it could work properly even circumstance temp. is lower than -30Deg C.

d. Stainless steel ion has performance of high temp. resistant, anti-stagnation temp. coating will not decay or get aging or disappears.

Dia. 47 with length of 1500mm.

Dia. 58 with length of 1800mm.

Dia. 58 with length of 2100mm.