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JFET conversion a la 1A7
Vintage dave (talk | contribs) (rearrange mods in SN order) |
Vintage dave (talk | contribs) (JFET conversion a la 1A7) |
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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 | ||
saturate it. | saturate it. At S/N 3270, this was fixed, by adding another stage to attenuate CM. | ||
The new "output amp" circuit board clips onto the rear bulkhead; | The new "output amp" circuit board clips onto the rear bulkhead; | ||
significant hand mods are required on the chassis. | significant hand mods are required on the chassis. | ||
This was also offered as | This was also offered as Modification kit 040-0447-00 to retrofit existing instruments. | ||
Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971, | Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971 (S/N 7000), following the lead of Type [[1A7]], the Nuvistors were replaced by JFETs to reduce drift. Mod kit 040-0590-00 was offered for 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]], | ||