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, and 50mV/div sensitivity.  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.
Then one 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.
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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]], [[545|545B]], [[544]], [[546]], and [[547]].
Type 1A2 was [[introduced in 1964]] together with Types [[1A1]], [[543B]], [[545|545B]], [[544]], [[546]], and [[547]].
It was designed to replace the venerable Type [[CA]], while the Type [[1A1]] delivered
It was designed to replace the venerable Type [[CA]], while the Type [[1A1]] delivered
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A

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