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Original production uses a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971, at serial number 7000, Type W was converted to FET input to reduce drift. Modification kit 040-0590-00 was offered to retrofit existing instruments. | Original production uses a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971, at serial number 7000, Type W was converted to FET input to reduce drift. Modification kit 040-0590-00 was offered to retrofit existing instruments. | ||
Original production Type W in a 556 mainframe won't | Original production Type W in a [[556]] mainframe won't | ||
meet spec for overdrive recovery time, because an overdriven W | meet spec for overdrive recovery time, because an overdriven W | ||
passes enough common-mode to the mainframe vertical amp to | passes enough common-mode to the mainframe vertical amp to | ||