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The VT31 RAF Valve Transmitting 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 VT31 and for more details see CV1031.

By laterally reversing the image the made in Canada is seen clearly.

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

References: Data-sheet & ³⁰⁰².

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum