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Superseded by 1A6 only; 1A7 is 500kHz vs 2MHz
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Vintage dave (talk | contribs) (Superseded by 1A6 only; 1A7 is 500kHz vs 2MHz) |
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At the time it was called Type 53D. | At the time it was called Type 53D. | ||
It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]]. This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes. | It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]]. This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes. | ||
Its final year in the catalog was 1968; it had been superseded by Type | Its final year in the catalog was 1968; it had been superseded by Type [[1A6]]. | ||
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | [[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | ||