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The VT-31 (American service code) is a directly heated tetrode the commercial type is ESG250. The picture shows that the screen grid helix extends well beyond the cylindrical anode. The control grid can be seen in the picture within the g2 helix. The anode is is not painted black or finned for heat transfer and the anode dissipation is 250 Watts.

See also VT-31 and for more details see CV1031.

The balloon envelope is 152 mm in diameter and is 368 mm tall.

Reference: ³⁰⁰².