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. | |||
Revision as of 10:42, 20 September 2010
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, and 50mV/div sensitivity. It uses a 7586 nuvistor at the front end as a cathode follower. 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. A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control 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.