XM triode
Inventory NumberVT1599
ClassificationVacuum Tube
Maker
Heintz & Kaufman Ltd.
fl. 1930s - 1940s
Cultural Region
Place of Origin
Dimensions19.1 × 16.4 × 16.4 cm (7 1/2 × 6 7/16 × 6 7/16 in.)
Description* = GRID RING
Signedprinted on glass: GAMMATRON / 304-H / HEINTZ & KAUFMAN
Inscribedin blue on glass:OK
in blue on base: OK? / 6/3/42
