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1A2: Difference between revisions
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1A1 and 1A2 share some mechanical design, but the circuits have few details in common. | 1A1 and 1A2 share some mechanical design, but the circuits have few details in common. | ||
Below serial number 11000, the 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower. | |||
Above serial number 11100, the front-end uses a FET for this function. | |||
After the front-end buffer, one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors. | |||
Silicon diodes form an analog multiplexer that switches between the two inputs. | Silicon diodes form an analog multiplexer that switches between the two inputs. | ||