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heater voltages on the 7586's. | heater voltages on the 7586's. | ||
Type 1A7 was designed by [[John Addis]] and [[introduced in 1966]]. | Type 1A7 (initially named [[F|Type F]]) was designed by [[John Addis]] and [[introduced in 1966]]. | ||
====Type 1A7A==== | ====Type 1A7A==== |