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'''7904''' | '''7904''' | ||
* [[Media:070-1399-00.pdf|Tektronix 7904 Operators Manual]] | * [[Media:070-1399-00.pdf|Tektronix 7904 Operators Manual]] | ||
* [[Media:070-2390-00.pdf|Tektronix 7904 Instruction Manual]] SN B260000+ (OCR) | * [[Media:070-2390-00.pdf|Tektronix 7904 Instruction Manual with PSU Schematics]] SN B260000+ (OCR) | ||
* [[Media:Servicing the Tek 7904 Power Supply.pdf|Servicing the 7904 High-Efficiency Power Supply]] | * [[Media:Servicing the Tek 7904 Power Supply.pdf|Servicing the 7904 High-Efficiency Power Supply]] | ||
* [[Media:Tektronix - 7904 - Horizontal Amplifier B010100 - B079999.pdf|Horizontal Amplifier SN B010100 - B079999]] | |||
'''7904A''' | '''7904A''' | ||
* [[Media:070-4593-00.pdf|Tektronix 7904A Manual]] (OCR) | * [[Media:070-4593-00.pdf|Tektronix 7904A Manual, May 1989 Revision]] (OCR, low quality scan, whole schematics) | ||
* [[Media:070-4593-00 hires split schematics.pdf|Tektronix 7904A Manual, May 1989 Revision]] (OCR, good quality scan, split schematics) | |||
<small> | <small> | ||
'''Modifications''' | '''Modifications''' | ||
* [https://hakanh.com/dl/docs/kitinstructions/050-0650-00.pdf 050-0650-00 (1980) Vertical amplifier IC replacement] | * [https://hakanh.com/dl/docs/kitinstructions/050-0650-00.pdf 050-0650-00 (1980) Vertical amplifier IC replacement] | ||
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{{Spec | Bandwidth | 500 MHz }} | {{Spec | Bandwidth | 500 MHz }} | ||
{{Spec | Fastest calibrated sweep | 500 ps/Div (with [[7B92A]], other time bases "uncalibrated for first 60 ns") }} | {{Spec | Fastest calibrated sweep | 500 ps/Div (with [[7B92A]], other time bases "uncalibrated for first 60 ns") }} | ||
{{Spec | Calibrator | DC, square wave (1 kHz or ½ B Sweep gate), 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA current loop }} | |||
{{Spec | Calibrator | | {{Spec | Vertical modes | Left / Alt / Add / Chop / Right }} | ||
{{Spec | | {{Spec | Horizontal modes | A / Alt / Chop / B }} | ||
{{Spec | | {{Spec | Trigger Source | Left / Vert Mode / Right }} | ||
{{Spec | Inputs | | |||
* Z Axis (15 V<sub>p-p</sub>) | |||
}} | |||
{{Spec | Outputs | | |||
* Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ) | |||
* +Sawtooth | |||
* +Gate | |||
* camera power | |||
* probe power | |||
}} | |||
{{Spec | CRT | | {{Spec | CRT | | ||
* Standard: (8×10 Div @ 1 cm), P31 (green) [[154-0644-05]] or P11 (blue) [[154-0644-09]] | * Standard: (8×10 Div @ 1 cm), P31 (green) [[154-0644-05]] or P11 (blue) [[154-0644-09]] | ||
* Option 4, high writing speed: (8×10 Div @ 0.5 cm) , P31 (green) [[154-0661-05]] or P11 (blue) [[154-0661-09]] | * Option 4, high writing speed: (8×10 Div @ 0.5 cm) , P31 (green) [[154-0661-05]] or P11 (blue) [[154-0661-09]] | ||
}} | |||
{{Spec | Acceleration voltage | 24 kV (+21 / -3 kV) }} | |||
{{Spec | Power | 90−132 V or 180−264 V, 48−440 Hz, 190 W max. }} | |||
{{Spec | Weight | 13.5 kg (30 lbs) }} | |||
{{Spec | Size | | |||
: 34.2 cm × 30.5 cm × 69.5 cm (H×W×L) | |||
: (13.5 in x 12.0 in x 23.8 in) | |||
}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | |||
* [[Media:A subnanosecond realtime oscilloscope garuts hallen.pdf|A Subnanosecond Realtime Oscilloscope]], [[Media:Tekscope 1971 V3 N4 Jul 1971.pdf | Tekscope Vol.3 No.4, July 1971]] | |||
* [https://lazyelectrons.wordpress.com/2018/11/24/tektronix-7904-oscilloscope-power-supply-repair/ 7904 Repair with Video] | |||
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7904.htm Tek 7904] / [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7904A.htm 7904A] @ amplifier.cd | |||
* [https://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope Repairing front panel buttons of Tektronix 7904 oscilloscope] | |||
* [http://www.barrytech.com/tektronix/tek7000/tek7904.html Tek 7904] / [http://www.barrytech.com/tektronix/tek7000/tek7904a.html 7904A] @ barrytech.com* | |||
* [https://www.youtube.com/watch?v=GQn0EqW-u74 Tektronix 7904 lab check in and LED MOD] by Zenwizard Studios @ YouTube | |||
{{Documents|Link=7904}} | |||
{{Documents|Link=7904A}} | |||
===7904A differences=== | ===7904A differences=== | ||
The 7904A ([[:Category:Introduced in 1984 |introduced in 1984]]) re- | The 7904A ([[:Category:Introduced in 1984 |introduced in 1984]]) borrows heavily from the previously introduced [[7104]] in terms of front panel layout, mechanical design, and electronics, re-implementing the vertical amplifier using Hypcon-packaged amplifier chips such as the [[155-0178-00]]. | ||
The 7904 had | The 7904 had the elaborate 5-decade built-in calibrator with variable rate that was common on all first-generation 4-bay [[7000-series scopes]], it was dropped from the 7904A. The [[7000-series remote control connector|rear remote control connector]] unique to early 7000-series scopes was dropped as well. | ||
In the 7904A, The Control Illumination switch moved to the rear panel, and the [[7000 series readout system|readout system]] | In the 7904A, The Control Illumination switch moved to the rear panel, and the [[7000 series readout system|readout system]] | ||
gained a pulsed mode in which it is synchronized with the sweep instead of interrupting the display at random times. | gained a pulsed mode in which it is synchronized with the sweep instead of interrupting the display at random times. | ||
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===Options=== | ===Options=== | ||
<div style="column-count:4;-moz-column-count:4;-webkit-column-count:4"> | <div style="column-count:4;-moz-column-count:4;-webkit-column-count:4"> | ||
* Opt.1: deletes read out system | |||
* Opt.2: X-Y delay compensation network | * Opt.2: X-Y delay compensation network | ||
* Opt.3: Extra EMI shielding | * Opt.3: Extra EMI shielding | ||
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==Operation== | ==Operation== | ||
The 7904 has many modes of operation. | The 7904 has many modes of operation. | ||
One mode is called "Independent-Pairs Display" in the manual, where the input to the left vertical plug-in is displayed using the B horizontal time-base plug-in, | One mode is called "Independent-Pairs Display" in the manual, where the input to the left vertical plug-in is displayed using the B horizontal time-base plug-in, | ||
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|- | |- | ||
! Serial Number | ! Serial Number | ||
! A9 Horizontal Amp. | |||
! Issue | ! Issue | ||
! Modification Kit | ! Modification Kit | ||
|- | |- | ||
|B010000-B081987 | |B010000-B081987 | ||
||670-1632-00 | |||
|Fully calibrated sweeps for rates of 1 ns/Div or faster requires a dedicated [[7B92]] (non A!) and the two units to be calibrated as a system. | |Fully calibrated sweeps for rates of 1 ns/Div or faster requires a dedicated [[7B92]] (non A!) and the two units to be calibrated as a system. | ||
|050-0636-01 | |050-0636-01 | ||
|- | |- | ||
|B081988-B219999 | |B081988-B219999 | ||
||670-1632-01 | |||
|Can be calibrated to either work with magnifier timebases ([[7B70]],[[7B80]]), or alternatively non-magnifying time bases ([[7B92A]]), but not both. | |Can be calibrated to either work with magnifier timebases ([[7B70]],[[7B80]]), or alternatively non-magnifying time bases ([[7B92A]]), but not both. | ||
|040-0791-00 | |040-0791-00 | ||
|- | |- | ||
|B220000 and above | |B220000 and above | ||
|670-1632-02/03 | |||
|None - fully compatible with all timebases and all sweep rates. | |None - fully compatible with all timebases and all sweep rates. | ||
|− | |− | ||
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|align=right| $52,000 | |align=right| $52,000 | ||
|} | |} | ||
==Notes== | ==Notes== | ||
# See [[7A11]] and [[John Addis]], ''Good Engineering and Fast Vertical Amplifiers'', in [[Jim Williams]] (Ed.), ''Analog Circuit Design: Art, Science and Personalities'' (1991), p.114, and [ | # See [[7A11]] and [[John Addis]], ''Good Engineering and Fast Vertical Amplifiers'', in [[Jim Williams]] (Ed.), ''Analog Circuit Design: Art, Science and Personalities'' (1991), p.114, and [[Media:Tektronix_New_Products_March_1972.pdf|Tektronix New Products 1972]] brochure. | ||
==Pictures== | ==Pictures== | ||
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</gallery> | </gallery> | ||
==Parts== | |||
{{Parts|7904}} | |||
{{ | {{Parts|7904A}} | ||
{{ | |||
{{Custom ICs|7000 series readout system}} | {{Custom ICs|7000 series readout system}} | ||
[[Category:7000 series non-storage mainframes]] | [[Category:7000 series non-storage mainframes]] | ||