B9A base: Difference between revisions
Jump to navigation
Jump to search
(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...") |
No edit summary |
||
Line 1: | Line 1: | ||
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. | ||
Line 6: | Line 6: | ||
==See also== | ==See also== | ||
* | * {{B7G base}} | ||
==Links== | ==Links== |
Revision as of 10:04, 2 July 2018
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.
B9A is the most common base for tubes from the 1940s to the 1960s.