7704

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Tektronix 7704
150 MHz non-storage mainframe
Tek 7704 (non-A) CRT and controls

Produced from 1969 to 1972

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 7704 is a 150 MHz, four-bay mainframe, one of the initial oscilloscopes introducing the 7000-Line in August 1969. It was designed by Gene Andrews and Bob Shand.

It is 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 can take two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.

It was superseded by the completely redesigned 7704A in 1973. There is also a rack-mount version, the R7704, that was produced until 1985, still with the original specifications (150 MHz) of the 7704.

Key Specifications

Bandwidth 150 MHz (with 7A11 or 7A16)
Fastest calibrated sweep 2 ns/Div
Calibrator DC, square wave (1 kHz or 1/2 B Sweep gate), 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA current loop
Vertical modes Left / Alt / Add / Chop / Right
Horizontal modes A / Alt / Chop / B
Trigger Source Left / Vert Mode / Right
Inputs
  • Z Axis High Speed (60 Vp-p, DC−100 MHz)
  • Z Axis High Sensitivity (2 Vp-p, DC−2 MHz; 0.4 Vp-p @ 20 MHz)
Outputs
  • Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ)
  • +Sawtooth
  • +Gate
  • camera power
  • probe power
CRT 8x10 Div @ 1cm/Div internal gradicule, 154-0609-00 distributed vertical deflection plates, with P31 phosphor, 24 kV acceleration (+21/-2.96)
Options
  • Opt.01 – without readout
  • Opt.02 – X-Y compensation network
  • Opt.03 – EMI shielding
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)
(13.5 in x 12.0 in x 21.7 in)

Operation

The 7704 has several modes of operation, all outlined in the manual:

Single-Trace Display
Vertical Mode: Left, Horizontal Mode: A. Single-trace vertical plugin installed in the left vertical compartment, single-timebase plugin installed in horizontal compartment A.
Provides a display of a single-trace vertical unit against one time-base unit.
Note: Any combination of one vertical and one horizontal plugin can be chosen as needed.
Dual-Trace Display
Vertical Mode: Alt or Chop, Horizontal Mode: A. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugin installed in horizontal compartment A.
Provides a display of two single-trace vertical units against one time-base unit.
Dual-Sweep Display
Vertical Mode: Left, Horizontal Mode: Alt or Chop. Single-trace vertical plugin installed in the left vertical compartment, single-timebase plugins installed in both horizontal compartments.
Provides a dual-sweep display of a single-trace vertical unit against two time-base units.
Dual-Trace/Dual-Sweep Display
Vertical Mode: Chop, Horizontal Mode: Alt or Chop. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugins installed in both horizontal compartments.
Provides a dual-trace, dual-sweep display of two single-trace vertical units against two time-base units (four total traces)
Sweep-Slaving Display
Vertical Mode: Alt, Horizontal Mode: Alt or Chop. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugins installed in both horizontal compartments.
Provides a dual-trace, dual-sweep display where the left vertical plugin is displayed at the sweep rate of the B timebase plugin, and similarly for the right vertical and A horizontal plugins.
Delayed-Sweep Display
Vertical Mode: Left, Horizontal Mode: Alt or Chop. Single-trace vertical plugin installed in the left vertical compartment. Delaying timebase plugin installed in horizontal compartment A, and a single-timebase plugin installed in horizontal-compartment B.
Provides a simultaneous display of a delaying timebase and delayed timebase, providing an effective "zoom" function.
X-Y Display
Vertical Mode: Left, Horizontal Mode: A. Single-trace vertical plugins installed in both the left vertical compartment and the A horizontal compartment.
The X signal is input into the A horizontal plugin while the Y signal is input into the left vertical plugin. Alternatively, some 7B series timebase plugins include X-Y capability.

Due to the modular design of the instrument, there are many more possible modes of operation. For example, horizontal plugins can be installed in both the vertical and horizontal plugins to provide a raster display, or dual-trace plugins can be used in any of the above configurations.

Internals

The 7704 was the first Tek lab scope to employ a switch-mode power supply (SMPS)[1]. 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.

The 7704 does not implement the Aux Y input (B16), therefore the Trace Separation control on a 7B92/7B92A will have no effect. (This was implemented on the 7704's successor, the 7704A.)

The 7704 contains a mercury-based elapsed time meter on the low voltage regulator board.

Links

Documents Referencing 7704

Document Class Title Authors Year Links
Tekscope 1969 V1 N5 Oct 1969.pdf Article Introducing the New Generation 1969 7000-series scopes • 7504 • 7704 • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7S11 • 7M11 • 7B50 • 7B51 • 7B70 • 7B71 • 7T11 • R5030 • 7000 series readout system • Miniature relays • Cam switches • Industrial Design • T7500 • T7700 • P6052 • P6053 • C-50 • C-51 • 204-2
Tekscope 1969 V1 N6 Dec 1969.pdf Article A New Logic for Oscilloscope Displays 1969 7000-series scopes • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7B50 • 7B51 • 7B70 • 7B71 • 7S11 • 7T11 • 7504 • 7704
Tekscope 1970 V2 N3 Jun 1970.pdf Article The 7000-Series Oscilloscopes as Signal Sources 1970 7704 • 7504 • 7503
Tekscope 1971 V3 N2.pdf Article Servicing the 7704 High-Efficiency Power Supply Charles Phillips 1971 7704
Tekscope 1971 V3 N3 May 1971.pdf Article Servicing the 7704 CRT Circuit Charles Phillips 1971 7704

Patents that may apply to 7704

Page Title Inventors Filing date Grant date Links
Patent US 3453403A Power selection device Eldon Hoffman 1966-08-18 1969-07-01 115 • 140 • 141 • 141A • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903

References

  1. ↑ See Tekscope Vol.4 No.2, March 1972, p.5

Pictures

  • 7704 front

    7704 front

  • 7704 rear

    7704 rear

  • 7704 CRT and controls

    7704 CRT and controls

  • Left internal

    Left internal

  • Right internal

    Right internal

  • Left side of 7704 contains power supply

    Left side of 7704 contains power supply

  • Right side of 7704 contains readout circuitry

    Right side of 7704 contains readout circuitry

  • A 7704 displaying the output of a function generator.

    A 7704 displaying the output of a function generator.

R7704

  • R7704 front

    R7704 front

  • R7704 front left (Screen)

    R7704 front left (Screen)

  • R7704 front right (plugin bay)

    R7704 front right (plugin bay)

  • R7704 rear

    R7704 rear

  • R7704 rear left

    R7704 rear left

  • R7704 rear right

    R7704 rear right

Components

Some Parts Used in the 7704

Part Part Number(s) Class Description Used in
155-0009-00 155-0009-00 Monolithic integrated circuit horizontal lockout logic 7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0010-00 155-0010-00 Monolithic integrated circuit chop divider and blanking 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0011-00 155-0011-00 Monolithic integrated circuit clock and chop blanking 485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00 155-0012-00 Monolithic integrated circuit Z Axis Logic 485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0013-00 155-0013-00 • 155-0013-01 Monolithic integrated circuit horizontal chop and alt. binary 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104
155-0022-00 155-0022-00 • 155-0022-01 Monolithic integrated circuit analog multiplexer 147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
T7700 154-0609-00 CRT CRT 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 analog-to-decimal 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
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