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555: Difference between revisions
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|designers= | |designers= | ||
|manuals= | |manuals= | ||
* [ | * [https://w140.com/mmm/tek-555.pdf 555 manual hosted locally] / [https://bama.edebris.com/manuals/tek/555 @ BAMA] | ||
* [https://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources] | |||
* [ | |||
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]] | * [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]] | ||
* [ | * [https://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)] | ||
* [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]] | * [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]] | ||
* [ | * [https://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF, OCR)] | ||
* [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]] | * [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]] | ||
* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]] | * [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]] | ||
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A saturable inductor, located in the power supply unit, is connected in series with its primary as the control element of an AC regulator circuit. | A saturable inductor, located in the power supply unit, is connected in series with its primary as the control element of an AC regulator circuit. | ||
One 6.3 V winding from the indicator unit filament transformer is fed back through the interconnection cable (part number [[012-032]]) | One 6.3 V winding from the indicator unit filament transformer is fed back through the interconnection cable (part number [[012-032]]) | ||
to supply heaters of specific tubes in the power supply unit (V624, V634, V664, V684, V694). Moreover, a regulator Tube (2AS-15, a | to supply heaters of specific tubes in the power supply unit (V624, V634, V664, V684, V694). Moreover, a regulator Tube (2AS-15, a Temperature Limited Diode) | ||
Temperature Limited Diode) is used to sense this filament voltage and derive a control DC current through the saturable inductor, | is used to sense this filament voltage and derive a control DC current through the saturable inductor, thereby closing the control loop. | ||
thereby | |||
One of the consequences of this scheme is that it the power supply unit will not energize the plate voltages (except +100 V) | One of the consequences of this scheme is that it the power supply unit will not energize the plate voltages (except +100 V) without the indicator unit connected, because | ||
without the indicator unit connected, because | |||
* the 12AX7 comparators and 6AU6 error amplifiers are heated from the indicator unit, so the main series pass tubes (6080s and 12B4s) are not driven even though they are heated from a transformer in the power supply unit; | * the 12AX7 comparators and 6AU6 error amplifiers are heated from the indicator unit, so the main series pass tubes (6080s and 12B4s) are not driven even though they are heated from a transformer in the power supply unit; | ||
* The primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit, i.e. the plate voltage transformer in the power supply will not get power unless the indicator unit is attached. | * The primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit, i.e. the plate voltage transformer in the power supply will not get power unless the indicator unit is attached. | ||
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=== Vertical Amplifier === | === Vertical Amplifier === | ||
The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]] | The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]] made of [[6DK6]] tubes. | ||
made of [[6DK6]] tubes. It is the same as the vertical output amplifier in the [[551]] and the [[545|545A]]. | It is the same as the vertical output amplifier in the [[551]] and the [[545|545A]]. | ||
An L-C [[delay line]] is located between the vertical output amplifier and the CRT vertical deflection plates for each channel. | An L-C [[delay line]] is located between the vertical output amplifier and the CRT vertical deflection plates for each channel. | ||
Twelve 6DK6 tubes per beam are used in the main amplifier. A pair of [[6DK6]]s are used | Twelve 6DK6 tubes per beam are used in the main amplifier. | ||
to pick up the trigger signal from the differential drive, and pass it to the horizontal | A pair of [[6DK6]]s are used to pick up the trigger signal from the differential drive, and pass it to the horizontal plug-in via a cathode follower as a single-ended trigger signal. | ||
plug-in via a cathode follower as a single-ended trigger signal. | |||
Another pair of [[6DJ8]]s are used as grid-line driver cathode followers, fed by the [[12BY7]] | Another pair of [[6DJ8]]s are used as grid-line driver cathode followers, fed by the [[12BY7]] input driver stage, which takes the differential input from the vertical plug-in. | ||
input driver stage, which takes the differential input from the vertical plug-in. | |||
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the CRT. | A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the CRT. | ||
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Tek 555 power interconnect.png|power interconnect | Tek 555 power interconnect.png|power interconnect | ||
</gallery> | </gallery> | ||
{{Parts|555}} | |||
[[Category:500 series scopes]] | [[Category:500 series scopes]] | ||
[[Category:Dual beam scopes]] | [[Category:Dual beam scopes]] | ||