Tektronix 7704A is a modular oscilloscope system Silver/Blue

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. Main designers were Luis Navarro (electrical) and Bob Shand (mechanical).

The 7704A followed the 7704 in 1972, improving bandwidth from 150 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 "A7704 acquisition unit", which contains the power supply, plug-in slots, and main interface board. On top is the "D7704 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. 

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

I purchased this unit with the thought of learning more about electronics. As far as I know, it works perfectly, although I never actually learned how to operate it and can't actually verify that.

• 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)

• Sold "As Is" / "Final Sale" - No Returns accepted
  
• Ships only within the Continental United States
  
• Buyer Pays $55 Shipping unless Local Pickup (Austin, TX area)