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B9A base: Difference between revisions
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(Created page with "The 9-pin '''B9A (Noval) tube base''' was developed in the late 1930s for miniaturized all-glass tubes, with the earliest tubes using this base commercially introduced in 1939...") |
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The 9-pin '''B9A (Noval) tube base''' was developed in the late 1930s for miniaturized all-glass tubes, with the earliest tubes using this base commercially introduced in | The 9-pin '''B9A (Noval) tube base''' was developed in the late 1930s for miniaturized all-glass tubes, with the earliest tubes using this base commercially introduced in the early 1940s. | ||
The pins are arranged evenly in a circle of eight or ten evenly spaced positions, with one pin omitted; this allows the tube to be inserted in only one orientation. The pins are stiff wires protruding through the bottom of the glass envelope and plug directly into the socket; the base is an integral part of the glass envelope. The pinched-off air evacuation nub is at the top of the tube. | The pins are arranged evenly in a circle of eight or ten evenly spaced positions, with one pin omitted; this allows the tube to be inserted in only one orientation. The pins are stiff wires protruding through the bottom of the glass envelope and plug directly into the socket; the base is an integral part of the glass envelope. The pinched-off air evacuation nub is at the top of the tube. | ||
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==See also== | ==See also== | ||
* | * {{B7G base}} | ||
==Links== | ==Links== | ||