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The Tektronix Type 555 is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in | The '''Tektronix Type 555''', nicknamed "Triple Nickel", is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in | ||
[[introduced_in_1959|1959]] and made until the late 1960's, when it was | [[introduced_in_1959|1959]] and made until the late 1960's, when it was replacedby the [[556]]. | ||
The system is split across two | The system is split across two cabinets, the main indicator unit and the external power supply unit. | ||
and the external power supply unit. | The power supply unit contains the main transformer, rectifiers and regulators for all of the voltages except the filament and CRT HV supplies. | ||
The power supply unit contains the main transformer, | |||
rectifiers and regulators for all of the voltages | |||
except the filament and CRT HV supplies. | |||
The filament and CRT HV voltages are generated in the 555 indicator unit. | The filament and CRT HV voltages are generated in the 555 indicator unit. | ||
The Tektronix 555 takes two | The Tektronix 555 takes two[[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]] | ||
[[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]] | |||
== Type 21 and 22 Timebases == | == Type 21 and 22 Timebases == | ||
The 555 uses special horizontal plug-ins | The 555 uses special horizontal plug-ins that contain the trigger and sweep. | ||
that contain the trigger and sweep. | Early instances of the 555 came with the 21 and 22 horizontal plug-ins. | ||
Early instances of the 555 came with | A rigid plug-in extension for the timebases (part number [[013-013]]) was included with every 555. | ||
the 21 and 22 horizontal plug-ins. | |||
A rigid plug-in extension for the timebases (part number [[013-013]]) | |||
was included with every 555. | |||
== Type 21A and 22A Timebases == | == Type 21A and 22A Timebases == | ||
Later instances came with | Later instances came with the 21A and 22A horizontal plug-ins, which use [[tunnel diodes]] for triggering. | ||
the 21A and 22A horizontal plug-ins, | |||
which use [[tunnel diodes]] for triggering. | |||
Delayed triggering is supported. | Delayed triggering is supported. | ||
Since the 555 is a dual-beam scope, it is also possible | Since the 555 is a dual-beam scope, it is also possible to start one of the sweeps while the other beam is sweeping. | ||
to start one of the sweeps while the other beam is sweeping. | |||
The upper-beam sweep and lower-beam sweeps are, in fact, totally independent. | The upper-beam sweep and lower-beam sweeps are, in fact, totally independent. | ||
== Filament Supply Regulator == | == Filament Supply Regulator == | ||
Regulation of the filament supply happens as follows: | Regulation of the filament supply happens as follows: | ||
There is a feedback loop that is formed between the indicator | There is a feedback loop that is formed between the indicator unit and the power supply unit. The power supply sends AC | ||
unit and the power supply unit. The power supply sends AC | through the interconnection cable to the indicator unit, where it is connected to the primary of the filament transformer. | ||
through the interconnection cable to the indicator unit, | A sample of the output of the filament transformer is sent back through the interconnection cable (part number 012-032) | ||
where it is connected to the primary of the filament transformer. | |||
A sample of the output of the filament transformer is sent | |||
back through the interconnection cable (part number 012-032) | |||
from the indicator unit to the power supply unit. | from the indicator unit to the power supply unit. | ||
This performs two functions. | This performs two functions. | ||
First, the filament voltage that is sent back to the power supply unit | First, the filament voltage that is sent back to the power supply unit is used to heat the cathodes of tubes in the power supply unit. | ||
is used to heat the cathodes of tubes in the power supply unit. | Second, this filament voltage is the feedback signal to a regulator in the power supply unit that controls how much voltage is sent | ||
Second, this filament voltage is the feedback signal to a regulator | to the filament transformer. One of the consequences of this scheme is that it is impossible to energize the power supply unit without | ||
in the power supply unit that controls how much voltage is sent | the indicator unit connected. The regulator tubes in the power supply would remain cold without filament power, and would not pass any current. | ||
to the filament transformer. One of the consequences of this scheme | |||
is that it is impossible to energize the power supply unit without | |||
the indicator unit connected. The regulator tubes in the power supply | |||
would remain cold without filament power, and would not pass any current. | |||
== Vertical Amplifier == | == Vertical Amplifier == | ||
The Tektronix 555 has a six-section differential | The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]] | ||
[[distributed amplifier|distributed vertical output amplifier]] | made of [[6DK6]] tubes. It is the same as the vertical output amplifier inthe [[551]] and the [[545|545A]]. | ||
made of [[6DK6]] tubes. It is the same as the vertical output amplifier | An L-C [[delay line]] is between the vertical output amplifier and the CRT vertical deflection plates | ||
the vertical output amplifier and the CRT vertical deflection plates | |||
for each channel. | for each channel. | ||
Line 81: | Line 62: | ||
It is split between two internal metal enclosures, each one containing a high voltage transformer and associated tubes. | It is split between two internal metal enclosures, each one containing a high voltage transformer and associated tubes. | ||
The lower beam HV power supply is based on transformer T901 and produces: | The lower beam HV power supply is based on transformer T901 and produces: | ||
* CRT anode voltage: + | * CRT anode voltage: +8,650 V | ||
* lower beam CRT cathode voltage: - | * lower beam CRT cathode voltage: -1,350 V | ||
* lower beam CRT control grid (blanking) voltage: floating, - | * lower beam CRT control grid (blanking) voltage: floating, -1,500 V | ||
The upper beam HV power supply is based on T801 and produces: | The upper beam HV power supply is based on T801 and produces: | ||
* upper beam CRT cathode voltage: - | * upper beam CRT cathode voltage: -1,350 V | ||
* upper beam CRT control grid (blanking) voltage: floating, - | * upper beam CRT control grid (blanking) voltage: floating, -1,500 V | ||
Rectification is performed by a total of six [[5642]] rectifier tubes. | Rectification is performed by a total of six [[5642]] rectifier tubes. | ||
Each of the two HV power supplies is independently regulated using | Each of the two HV power supplies is independently regulated using a two-stage common-cathode amplifier based on a [[12AU7]] dual triode. | ||
a two-stage common-cathode amplifier based on a [[12AU7]] dual triode. | |||
The oscillator tube is a [[6CZ5]] power pentode. | The oscillator tube is a [[6CZ5]] power pentode. | ||
Line 97: | Line 77: | ||
==Links== | ==Links== | ||
* [https://www.youtube.com/watch?v=BvbNBZX6kNE 555 in operation] @ YouTube | * [https://www.youtube.com/watch?v=BvbNBZX6kNE Tektronix 555 in operation] @ YouTube | ||
* [http://www.barrytech.com/tektronix/vintage/tek555.html Tektronix 555 @ barrytech.com] | |||
* [http://www.radiomuseum.org/r/tektronix_dual_beam_oscilloscope_55_2.html Tektronix 555 @ radiomuseum.org] | |||
* [http://www.lemis.com/grog/Albums/Tektronix-555.php Greg's 555] - lots of photos | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 555 front fl2.jpg | |||
Tek 555 front fl.jpg|front view: two timing plug-ins on top and two vertical plug-ins on bottom | |||
555_ps.jpg|external power supply | |||
555_left_int.jpg|left side view | |||
555_rt_int.jpg|right side view | |||
555_top_int.jpg|top view | |||
555 P11.JPG|555 with P11-option | |||
555_P7.jpg|555 with P7-option (fast blue and slow green Phosphor) | |||
Tek 555 cable 3.jpg|Power interconnect, part number 012-032 | |||
Tek 555 cable 2.jpg|Power interconnect, part number 012-032 | |||
Tek 555 cable 1.jpg|Power interconnect, part number 012-032 | |||
Tek 555 timebase interconnect3.png|timebase interconnect | |||
Tek 555 block.png|555 block diagram | |||
555 lower vert.png|lower beam vertical amplifier | |||
Tek 555 power interconnect.png|power interconnect | |||
Tek 555 lvreg.png|heater regulator | |||
Tek 555 21 trigger.png|Type 21 trigger | |||
Tek_555_block.png|block diagram | |||
Tek 555 crt circuit.png|CRT circuit | |||
Tek 555 crt1.jpg|CRT | |||
Tek 555 crt2.jpg|CRT | |||
Tek 555 crt3.jpg|CRT | |||
Tek 555 crt4.jpg|CRT | |||
Tek 555 crt5.jpg|CRT | |||
Tek 555 crt6.jpg|CRT | |||
Tek 22a front.jpg|22A front | |||
Tek 22a trigger board.jpg|22A TD trigger board | |||
Tek 22a top.jpg| 22A top | |||
Tek 22a bottom.jpg| 22A bottom | |||
Tek 21 front.jpg| 21 front | |||
Tek 21 top.jpg| 21 top | |||
Tek 21 bottom.jpg| 21 bottom | |||
Tek 22 front.jpg| 22 front | |||
Tek 22 top.jpg| 22 top | |||
Tek 22 bottom2.jpg| 22 bottom | |||
Tek 21a front.jpg| 21A front | |||
Tek 21a top.jpg| 21A top | |||
Tek 21a bottom.jpg| 21 bottom | |||
Tek 21a trigger board.jpg| 21A TD trigger board | |||
Tek 013-013.JPG|timebase plug-in extender, part number 013-013 | |||
Wellenkino 555-2.jpg | |||
Wellenkino 555.jpg | |||
</gallery> | </gallery> | ||