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The 1979 catalog lists the following recommended probes for the 7A26:
The 7A26 200MHz Amplifier Plug-In is a dual trace plug-in which offers 5 operating modes, trigger-source selectability, and trace identify. Vertical sensitivity of 5 mV/div to 5 V/div and with appropriate mainframe, DC to 200MHz bandwidth over the entire range. Also include a 20MHz bandwidth limit switch which reduces noise in lower-frequency applications.
The 7a26 , a dual trace pluggin amplifier, is the basic building block for three or four trace operation . It features constant bandwidth for all deflection factors. It has 5 operating modes : CH1, CH2, ALT, CHOP, ADD) trigger source selection (Ch1, CH2, Mode.)
Bandwidth may be set at full or limited to 20Mhz.