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heater voltages on the 7586's. | heater voltages on the 7586's. | ||
Type 1A7 was [[introduced in 1966]]. In 1968 it was superseded by | Type 1A7 was designed by [[John Addis]] and [[introduced in 1966]]. | ||
the FET-equipped '''Type 1A7A''', which also doubled the bandwidth | In 1968 it was superseded by the FET-equipped '''Type 1A7A''' (designed by [[Thor Hallen]]), | ||
and the common-mode rejection. Type 1A7A remained available | which also doubled the bandwidth and the common-mode rejection. | ||
until the end of the [[500-series scopes|500-series]] line after 1974. | Type 1A7A remained available until the end of the [[500-series scopes|500-series]] line after 1974. | ||
==Specifications== | ==Specifications== |