Tektronix A 20 MHz Amplifier Plug-In (1956)

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$85 (1956) ...
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    Type A Wide-band Calibrated Preamp plug-in module for 1960-1972 production Tektronix oscilloscopes in the 530, 540, and 550 series. .05 20 V/CM, DC coupled, ~.015 usec preamp risetime. 1 Meg./47 uuF inputs