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Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in 1954 as Type 53D, | Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in 1954 as Type 53D, | ||
was briefly renamed Type 53D/54D in 1955 with the introduction | was briefly renamed Type 53D/54D in 1955 with the introduction | ||
of the [[541]] and [[545], then quickly renamed Type 53/54D, | of the [[541]] and [[545]], then quickly renamed Type 53/54D, | ||
then shortened to Type D in 1959 with the introduction of | then shortened to Type D in 1959 with the introduction of | ||
the 5xxA scopes. Its last year was 1968. | the 5xxA scopes. Its last year was 1968. | ||
Some production used a pair of 5814 tubes at the input while others used 12AU7's. | Some production used a pair of [[5814]] tubes at the input while others used [[12AU7]]'s. | ||
These two tube types have different heater currents, and because the heaters are | These two tube types have different heater currents, and because the heaters are | ||
series-wired, you cannot switch from one type to the other without circuit modification. | series-wired, you cannot switch from one type to the other without circuit modification. | ||