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1A2: Difference between revisions
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The Tektronix 1A2 is a two-channel plug-in amplifier for 500-series scopes. It provides a -3dB point of | The Tektronix 1A2 is a two-channel plug-in amplifier for 500-series scopes. It provides a -3dB point of | ||
50MHz in a 544, 546, or 547. It uses a 7586 nuvistor at the front end as a cathode follower. | 50MHz in a 544, 546, or 547, and 50mV/div sensitivity. It uses a 7586 nuvistor at the front end as a cathode follower. | ||
input of an NPN differential amplifier is driven to produce a differential current-mode signal at | Then 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. | the collectors. Silicon diodes form an analog multiplexer that switches between the two inputs. | ||
A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control | A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control | ||
the diodes that select the input channel. | the diodes that select the input channel. | ||
Type 1A2 was introduced in 1964 together with Types [[1A1]], [[543B]], [[545B]], [[544]], [[546]], and [[547]]. | |||
It was designed to replace the venerable Type [[CA]], while the Type [[1A1]] delivered | |||
ten times the sensitivity at a higher price. They share some mechanical design, but the | |||
circuits have few details in common. | |||