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rearrange mods in SN order
Vintage dave (talk | contribs) m (add link) |
Vintage dave (talk | contribs) (rearrange mods in SN order) |
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(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.) | (Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.) | ||
Early 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 | ||
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This was also offered as mod kit 040-0447-00. | This was also offered as mod kit 040-0447-00. | ||
Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971, at serial number 7000, the Nuvistors were replaced by JFETs to reduce drift. Modification kit 040-0590-00 was offered to retrofit existing instruments. | |||
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]], | ||
follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]]. | follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]]. | ||