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The Tektronix 7704 is a four-bay mainframe introduced in 1969 that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. The rated bandwidth is 150MHz for the 7704 and 200MHz for the 7704A.  There was also an option (option 9) to have the bandwidth extended to 250MHz. 
{{Oscilloscope Sidebar|
title=Tektronix 7704|
image=7704-front.jpg |
caption=Tek 7704 (non-A) CRT and controls |
introduced=1969 |
discontinued=1972 |
summary=150 MHz non-storage mainframe|
manuals=
* [http://bama.edebris.com/download/tek/7704/tek-7704.pdf Tektronix 7704 Manual (PDF)]


The 7704 has a special modular construction. At the bottom is the "acquisition unit",
* [[Media:Tekscope 1971 V3 N2.pdf|Tekscope Vol. 3 No. 2, Mar 1971: Servicing the 7704 switch-mode power supply]]
which contains the power supply, plug-in slots, and main interface board. On top is
* [[Media:Tekscope_1971_V3_N3_May_1971.pdf|Tekscope Vol. 3 No. 3, May 1971: Servicing the 7704 CRT circuit]]
the "display unit", which contains the CRT, HV power supply, and output amplifiers for
}}
driving the deflection plates of the CRT.  These units detachA large multipin connector
The '''Tektronix 7704''' is a 150 MHz, four-bay mainframe
passes signals and power from the acquisition unit to the display unit. It is important
[[introduced in 1969|introduced in August 1969]] that can take
not to damage this connector when assembling or disassembling the units.
two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]]
and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]]. The 7704 is one of the initial oscilloscopes introducing the [[Introduction_to_the_7000-Series|7000-Line]] and very lavishly build using contacts embedded in the aluminium frame for interconnecting the gold plated PCB boards.   
It was superseded by the completely redesigned [[7704A]] in 1973.  
There is also a rack-mount version, the '''R7704'''.


An optional component, the P7001 Processing Unit, can be added to the system between the
{{BeginSpecs}}
acquisition unit and the display unitThe P7001 contains a digitizer, memory, and
{{Spec | Fastest cal. sweep | 2 ns/Div }}
display electronics.  Early versions of the P7001 use core memory.  Later versions
{{Spec | Bandwidth | 150 MHz (with [[7A11]] or [[7A16]]) }}
use semiconductor RAM.  The P7001 assumes a repeating input signal and
{{Spec | Calibrator | 4 mV to 40 V in decade steps, 2/20/200/400 mV into 50 Ω, 40 mA; 1 kHz }}
periodically samples the horizontal and vertical
{{Spec | Outputs | Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power }}
signals simultaneously.  This allows it to fill the memory with data points represented
{{Spec | Z Axis input | two: High Speed (60 V<sub>p-p</sub>, DC-100 MHz), High Sensitivity (2 V<sub>p-p</sub>, DC-2 MHz; 0.4 V<sub>p-p</sub> @ 20 MHz) }}
as coordinate pairs, (x1,y1), (x2,y2), (x3,y3), etc. It is not necessary that x2 be greater
{{Spec | CRT | [[154-0609-00]], 8 cm × 10 cm graticule, [[distributed vertical deflection plates]], P31 [[phosphor]] standard }}
than x1.
{{Spec | Acceleration voltage | 24 kV (+21/-2.96) }}
{{Spec | Power | 90-136 V or 180-272 V, 48-440 Hz, 210 W max. }}
{{Spec | Weight | 19.1 kg (42 lbs) }}
{{Spec | Size | 34.2 cm × 30.5 cm × 55.1 cm (H×W×L) }}
{{EndSpecs}}


==Internals==
The 7704 uses an all-discrete switch-mode power supply (SMPS) in 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 [[7000_series_readout_system|readout]] use the classic TEK 7000 series custom ICs ([[155-0009-00]] to [[155-0022-00]]), the horizontal and vertical amplifiers are completely discrete. 
==Links==
* [http://www.barrytech.com/tektronix/tek7000/tek7704.html Tek 7704 @ barrytech.com]
==Pictures==
<gallery>
<gallery>
Image:7704_powersupply.jpg|Left side of 7704 contains power supply.
7704-front.jpg      | 7704 front
Image:7704 right2.jpg|Right side of 7704 contains readout circuitry.
Tek_7704_rear.jpg    | 7704 rear
Tek 7704 2.jpg      | 7704 CRT and controls
tek-r7704.jpg        | R7704
Tek_7704_left.jpg    | Left internal
Tek 7704 right.jpg  | Right internal
7704_powersupply.jpg | Left side of 7704 contains power supply
7704 right2.jpg     | Right side of 7704 contains readout circuitry
</gallery>
</gallery>
[[Category:7000 series non-storage mainframes]]

Revision as of 15:05, 29 September 2020

{{{manufacturer}}} 
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 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 build using contacts embedded in the aluminium frame for interconnecting the gold plated PCB boards. It was superseded by the completely redesigned 7704A in 1973. There is also a rack-mount version, the R7704.

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 uses an all-discrete switch-mode power supply (SMPS) in 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 horizontal and vertical amplifiers are completely discrete.

Links

Pictures