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Tektronix 7704A
200 MHz non-storage mainframe
Tektronix 7704A

Produced from 1973 to 1987

Manuals – Specifications – Links – Pictures

The Tektronix 7704A is a modular oscilloscope in the 7000 series that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.

The 7704A followed the 7704, improving bandwidth to 200 MHz (regular model, optimized for transient response) or 250 MHz (option 9, bandwidth-optimized). The R7704 rack-mount version continued to be named just R7704.

The 7704A has a special modular construction. At the bottom is the "acquisition unit", which contains the power supply, plug-in slots, and main interface board. On top is the "display unit", which contains the CRT, HV power supply, and output amplifiers for driving the deflection plates of the CRT. These units detach. A large multi-pin connector passes signals and power from the acquisition unit to the display unit. It is important not to damage this connector when assembling or disassembling the units.

An optional component, the P7001 Processing Unit, can be added to a 7704A between the acquisition unit and the display unit. The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the Acquisition-Processor-Display (APD) Interface shown below.

The 7704A SMPS uses a custom Tek chip to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit.


Fastest cal. sweep 2 ns/Div
Bandwidth 200 MHz (with 7A19)
Calibrator 4 mV to 40 V in decade steps, 2/20/200/400 mV into 50 Ω, 40 mA; 1 kHz
Outputs Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power
Acceleration voltage 24 kV
Power 90-132 V or 180-264 V, 48-440 Hz, 180 W max.
Weight 13.6 kg (30 lbs)
Size 34.5 cm × 30.5 cm × 57.7 cm (H×W×L)
  • Option 1: No Readout
  • Option 3: Extra EMI shielding
  • Option 4: Reduced scan CRT (4x5 cm graticule)
  • Option 7: Deletes signals out (Vertical signal out, +Sawtooth, +Gate, Z-axis in, remote reset input). Readout always free-running.
  • Option 9: Extended bandwidth (250 MHz, trades pulse response)



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