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BS4ASensibly equivalent¶ to:
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The BS4A is a protective spark gap. The English Electric logo together with the AEI logo indicating a date after the 1968 merger.
The central ceramic tube - with gaps - has metal discs top and bottom. The electrodes of the spark gap are within.The wide glass tube envelope is 30 mm in diameter and, excluding the IO base pins, is 65 mm tall.Reference: Observation. |
Updated March 24, 2025.
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