The Tektronix 7704A
The Tektronix scope came with the original cart (Tektronix Scope Mobile) and 4 plugins. Some other goodies that came along with it were the manual, BNC cables, and calibration certificate.
-THE PLUGINS-
Plugin 7B70 - Horizontal Time Base Unit similar to the 7B70. In combination, they provide a delaying-sweep mode of operation; the 7B71 being the DELAYING SWEEP and the 7B70 the DELAYED SWEEP.
The 7B70 also has a horizontal amplifier input for uncalibrated X-axis deflection from an external source.
Both units can be used singly in all 7000-Series mainframes, or in combination to add the delaying-sweep function. Independent dual-sweep operation is possible only in mainframes with two horizontal amplifers using CHOP or ALT modes.
Source: http://www.barrytech.com/tektronix/tek7000/tek7b70.html
Plugin 7B71 - Horizontal Time Base Unit similar to the 7B70. The 7B71 (occupying the A horizontal channel) contains the DELAY TIME MULTIPLIER and control circuitry to release the 7B70 DELAYED SWEEP (B horizontal channel) at a predetermined point during the delaying sweep. After release, the delayed sweep can be programmed to begin immediately or wait for the next trigger event.
Both units can be used singly in all 7000-Series mainframes, or in combination to add the delaying-sweep function. Independent dual-sweep operation is possible only in mainframes with two horizontal amplifers using CHOP or ALT modes.
Plugin 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 plug-in 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.
When Used in combination with another 7A26 plug-in, the Tektronix 7704A can become a 4 Channel 200 Mhz Scope!!!

The Tektronix 7704A is a Great scope for general and everyday use for your electronics lab!
Hooking up the Tektronix 7704A to the Analog Discovery by Digilent!
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