The 1B29 is a triggered spark gap. Two or more are used in series and the reference 1B29 below gives details of the type of circuit these modulators are used in.![](../pics/acl0063a.jpg)
The evacuation pip at the side. The central electrode has broken away from the top connector.![](../pics/acl0063b.jpg)
The broken electrode is loose within the outer cylinder.The thin glass tube envelope is 21 mm in diameter, and including the base is 83 mm tall.Reference: Data-sheet. Type 1B29 was first introduced in 1946. See also 1946 adverts. |
Updated April 13, 2019.
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