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Vintage dave (talk | contribs) (Output Amp mod kit) |
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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 | |||
meet spec for overdrive recovery time, because an overdriven W | |||
passes enough common-mode to the mainframe vertical amp to | |||
saturate it. The fix, beginning at S/N 3270: Add another stage, to attenuate CM. | |||
The new "output amp" circuit board clips onto the rear bulkhead; | |||
significant hand mods are required on the chassis. | |||
This was also offered as mod kit 040-0447-00. | |||
In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], | In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], | ||