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The '''Tektronix Type 1A4''' is a 1-series vertical plug-in for [[500-series scopes]].
The '''Tektronix Type 1A4''' is a 1-series vertical plug-in for [[500-series scopes]].
It has four input channels and 50 MHz bandwidth.  
It has four input channels and 50 MHz bandwidth.  
The designer was [[Al Allworth]].


Type 1A4 was [[introduced in 1967]] and lasted until the end of the [[500-series scopes]] line.
Type 1A4 was [[introduced in 1967]] and lasted until the end of the [[500-series scopes]] line.

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