7704

Manuals – Specifications – Links – Pictures

The Tektronix 7704 is a 150 MHz, four-bay mainframe introduced in August 1969 that can take two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. The 7704 is one of the initial oscilloscopes introducing the 7000-Line and very lavishly built, using contacts embedded in the aluminium frame for interconnecting the gold plated circuit boards. It also features the 7000-series remote control connector on the rear panel.

It was superseded by the completely redesigned 7704A in 1973. There is also a rack-mount version, the R7704, that was produced until 1984, still with the original specifications (150 MHz) of the 7704.

Key Specifications

Fastest cal. sweep	2 ns/Div
Bandwidth	150 MHz (with 7A11 or 7A16)
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
Z Axis input	two: High Speed (60 Vp-p, DC−100 MHz), High Sensitivity (2 Vp-p, DC−2 MHz; 0.4 Vp-p @ 20 MHz)
CRT	154-0609-00, 8 cm × 10 cm graticule, distributed vertical deflection plates, P31 phosphor standard
Acceleration voltage	24 kV (+21/−2.96)
Power	90−136 V or 180−272 V, 48−440 Hz, 210 W max.
Weight	19.1 kg (42 lbs)
Size	34.2 cm × 30.5 cm × 55.1 cm (H×W×L)

Internals

The 7704 was the first Tek lab scope to employ a switch-mode power supply (SMPS). The SMPS, designed by Gene Andrews, uses an all-discrete resonant half-bridge topology. The CRT voltages and heating are produced in a separate switching stage running off the main SMPS DC output.

Logic, channel switching, and readout use the classic TEK 7000 series custom ICs (155-0009-00 to 155-0022-00), the vertical amplifier (also designed by Andrews) and the horizontal amplifier are completely discrete.

Links

• Tek 7704 @ barrytech.com

Pictures

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  7704 front

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  7704 rear

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  7704 CRT and controls

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  R7704

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  Left internal

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  Right internal

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  Left side of 7704 contains power supply

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  Right side of 7704 contains readout circuitry

R7704

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  R7704 front

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  R7704 front left (Screen)

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  R7704 front right (plugin bay)

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  R7704 rear

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  R7704 rear left

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  R7704 rear right

Custom ICs used in the 7704

Custom ICs used in the 7000 series readout system

Page	Model	Part nos	Description	Designers	Used in
155-0014-01	M019D	155-0014-00 • 155-0014-01	A/D converter	Barrie Gilbert	7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001
155-0015-01	M020F	155-0015-00 • 155-0015-01	analog data switch	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0017-00	M025	155-0017-00	5 MHz decade counter	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0018-00	M026	155-0018-00	zeros logic control	Les Larson	7000 series readout system • 7934
155-0019-00	M027	155-0019-00	decimal point and spacing control	Les Larson	7000 series readout system
155-0020-00	M028	155-0020-00	output assembler	Les Larson	7000 series readout system
155-0021-00	M029C	155-0021-00 • 155-0021-01	timing generator	Les Larson	7000 series readout system • 7854 • 7934
155-0023-00	M160	155-0023-00	character generator (0 1 2 3 4 5 6 7 8 9)	Barrie Gilbert	7000 series readout system
155-0024-00	M161	155-0024-00	character generator (↓ < I / + - + C Δ >)	Barrie Gilbert	7000 series readout system
155-0025-00	M162	155-0025-00	character generator (m μ n p X K M G T R)	Barrie Gilbert	7000 series readout system
155-0026-00	M163	155-0026-00	character generator (S V A W H d B c Ω E)	Barrie Gilbert	7000 series readout system
155-0027-00	M164	155-0027-00	character generator (U N L Z Y P F J Q D)	Barrie Gilbert	7000 series readout system