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The Type 585 is a 100MHz [[580-Series scope]] introduced by Tektronix in  
{{Oscilloscope Sidebar
[[introduced_in_1959|1959]] and made through the 1960's.
|manufacturer=Tektronix
The 585 uses [[580-series plug-ins]],
|series=580-series scopes
which look like [[letter-series and 1-series plug-ins]]  
|model=585
but are electrically different,  
|image=Tek-585-82.jpg
primarily in the impedance of the signal interface between the plug-in and the scope.
|caption=Tektronix 585 with [[82|Type 82]] plug-in
|introduced=1959
|discontinued=1972
|summary=100 (95) MHz oscilloscope
|designers=John Gates;
|manuals=
* [[Media:070-171.pdf|Tektronix 585 Manual]] (OCR)
* [[Media:070-0391-01.pdf|Tektronix 585A Manual]]
* ''[[Media:070-392.pdf|070-392 RM585A Manual needed]]''
* [[Media:070-427.pdf|Tektronix 585A Operator's Manual]] (4"×5")
<small>
 
'''Calibration'''
* [[Media:Service Scope 39 Aug 1966.pdf|580 series gain adjustment procedure, in Service Scope 39, Aug 1966]]
* [https://w140.com/tek_fcp/tek_585_fac_cal.pdf Tektronix 585 Factory Calibration Procedure, June 1961]
* [[Media:Tek 585a fcp nov 1968.pdf|Tektronix 585A Factor Calibration Procedure, November 1968]]
 
'''Modifications'''
* [https://web.archive.org/web/20170727004536/http://www.reprise.com/host/tektronix/reference/581_relay.asp  Power supply Mod (From Stan's website, archived)]
</small>
}}
The '''Tektronix 585''' is a 100 MHz [[580-series scopes|580-Series scope]] that Tektronix [[introduced in 1959]].
It was designed by [[John Gates]].
The [[581]] is the same with a single timebase.
The 585A facelift model was introduced in 1963 and discontinued after 1971. 
 
The 58x series were the first Tek scopes with [[distributed deflection plates]], the first Tek scopes to use a cross-wound continuous delay line, and the last with a [[distributed amplifier]].
 
At 100 MHz (down-rated to 95 MHz in 1962 and 85 MHz for the 585A in 1963) with the [[80|Type 80 plug-in]] and up to 85 MHz with the dual-channel [[82|Type 82]], they were the highest-speed general purpose scopes of Tek's tube scope era. (The 1 GHz [[519]] was specialized with no vertical amplifier.)
 
The 585's front panel layout is almost identical to the [[545A]] that came out at the same time. The 585 also shares internal construction and circuits such as the power supply with the [[535]]/[[545]] line of scopes.
__TOC__
{{BeginSpecs}}
{{Spec | Rise time | 3.5 ns with [[80 | Type 80]] plugin and [[P80|P80 probe]] }}
{{Spec | Timebase A | 50 ns/Div to 2 s/Div, 1−2−5, variable ×2.5, magnifier ×5, single sweep; X input }}
{{Spec | Timebase B | 2 μs/Div to 1 s/Div, 1−2−5, can delay timebase A by 1 μs to 10 s }}
{{Spec | CRT | [[T581]], distributed vertical deflection plates, 10 kV acceleration }}
{{Spec | Outputs | A Sawtooth, A Gate, B Gate, Calibrator (0.2 mV to 100 V<sub>p-p</sub>, 1−2−5) }}
{{Spec | Power | 107−127 or 214−234 V<sub>AC</sub>, 50-60 Hz, 890 VA / 710 W}}
{{Spec | Dimensions | (W/L/H) 330×610×432 mm³ (13"×24"×17") }}
 
{{EndSpecs}}
 
==585A differences==
The 585A uses a tunnel-diode trigger circuit (see below), adds HF Sync and AC LF reject modes to the timebase A trigger selector, and adds a [[trace rotation]] coil.
 
==Links==
* [https://www.radiomuseum.org/r/tektronix_crt_oscilloscope_585.html Tek 585] @ radiomuseum.org
* [https://youtube.com/watch?v=RvemavylsCI Inside a Tek 585A] @ YouTube
 
==History==
[https://vintagetek.org/my-early-tektronix-days-by-john-kobbe-2/ John Kobbe said]:
<blockquote>
Later on there was another special CRT designed with [[distributed deflection plates|distributed vertical deflection]] for the 100 Megahertz 580 (well almost 100 MHz).
 
The 580 was the first, at least at Tek, to use a cross wound continuous signal [[delay line]].
 
The 580 used a similar horizontal system lifted from the 530s which was too slow and [had] insufficient writing rate.
 
The [[P80|active probe]] and [[580 Series plug-in interface|plug in system]] left a lot to be desired. I wasn’t very proud of the 580 design as it was too compromised.
</blockquote>
==Internals==
=== Plug-in Interface ===
The 585 uses [[580-series plug-ins]] which look like [[letter-series and 1-series plug-ins]]  
but are electrically different. The main difference is the impedance of the signal that passes
through the interface from the plug-in to the mainframe.
 
In 530/540/550-series scopes, the plug-in expects the mainframe to be a high impedance load,
driving tube grids in the mainframe.
The [[580 Series plug-in interface]], on the other hand, presents a differential transmission line
input with an impedance of 93 Ω per side, going into the first distributed amplifier stage.  The
other end of this transmission line is returned to the plug-in for termination and biasing.
The [[580 Series plug-in interface|pin-out of the interface connector]] is also different,
the 580-series pin-out being essentially flipped 180° from its 530/540/550 series counterparts
(''Signal Out'' is between pins 14 and 16 as opposed to between pins 1 and 3, etc.)
 
The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585.
The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585.


=== Trigger Circuit ===
The original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential  
The original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential  
trigger amplifier made of a pair of [[6EW6]] nuvistors, followed by a Schmitt trigger
trigger amplifier made of a pair of [[6EW6]] miniature pentodes, followed by a Schmitt trigger
made of a pair of [[6DJ8]] tubes.  Starting at serial number 1071, the 6DJ8 Schmitt trigger
made of a pair of miniature dual triode tubes.   
was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP
transistor.  The tunnel diode is AC-coupled to the base-emitter junction of the transistor.
 
Like the [[545]], [[551]], and [[555]], the 585 uses a [[distributed amplifier]] for vertical deflection.
Unlike the other 500-series scopes, the 585 uses a CRT,
with distributed vertical deflection plates, the [[T581]],
enabling it to have both high sensitivity and fast risetime. 
The total CRT acceleration voltage is 10kV.


Several improvements were published for the 585 circuitry, including the enhanced trigger
Starting at serial number 1071 (and sometimes retrofitted to earlier instruments), the dual-triode
circuit. If all of those changes are applied to a 585, it is essentially a 585A.
Schmitt trigger circuit was replaced by an [[STD615]] 10 mA [[tunnel diodes|tunnel diode]] AC-coupled to the base-emitter junction of an [[OC171]] germanium PNP transistor as a pulse amplifier.


A rackmount version was also made.
The slower "B" timebase uses a Schmitt trigger circuit.


* [http://bama.edebris.com/download/tek/585/585.pdf Tektronix 585 Manual (PDF)]
=== Vertical Signal Path ===
Like the [[545]], [[551]], and [[555]], the 585 uses two [[distributed amplifier]]s in the vertical signal path, one with seven differential [[6DJ8]] stages driving a helically-wound, differential [[delay line]], followed by a five-stage differential distributed driver amplifier and a [[7699]] or [[6939]] dual tetrode power stage driving the CRT.
 
Unlike the other 500-series scopes, the 585 uses a CRT with [[distributed vertical deflection plates]], the [[T581]], enabling it to have both fast rise time and high sensitivity (~5 V/cm vertically), albeit at the cost of limiting vertical deflection to slightly over 4 cm. Total acceleration voltage is 10 kV.
 
Several improvements were published for the 585 circuitry, including the enhanced trigger circuit.
If all of those changes are applied to a 585, it is essentially a 585A.
 
After serial number 2585, the back termination of the final distributed amplifier output was made adjustable.
The manual says this (field-installable) modification (040-275) is "required for proper operation of plug-ins with numbers above [[81|Type 81]]". Non-A instruments with this termination have a front panel label reading "standardized vertical".
 
===Power Supply===
 
The 585 power supply is similar to other Tek scopes of the era such as the [[549]].  A linear regulator with a [[5651]] reference tube, a [[12AX7]]/[[6AU6]] error amplifier and three parallel [[12B4]] series pass tubes produces −150 V. 
This is the only adjustable rail, all other regulated voltages are referenced to it. 
The +100 V and +350 V regulators use half a [[6080]] each as the pass element, the +225 V two. 
In the +500 V path, a [[12B4]] performs this function. 
The unregulated +325 V input to the 225 V regulator is used to supply the HV oscillator, a [[6AU5]].
 
A transistor-based regulator supplies a +12.6 V heater voltage to the plug-in.
 
A [[delay relay|6NO45 delay relay]] controls a multi-contact relay to switch supply voltages on only after the tubes are warmed up. 
When the main relay engages, the delay relay is cut out so it will be ready to delay again even after a quick interrupt in power input.
 
The 12.6 V power supply is referenced to the +100 V regulated output.  Since +100 V is not available during the warm-up period, an unregulated +100 V (~+180 V) is fed as the reference to the 12.6 V power supply during the warm-up period, then cut out by the multi-contact relay post warmup.
 
The 585 contains a 53°C (128°F) [[thermal cutoff]].
 
The power transformer, T601, is Tektronix part number [[120-0141-00]].
 
===Semiconductors===
The 585 uses semiconductor diodes as rectifiers and germanium transistors in the 12.6 V power supply, and except for unmodified instruments before SN 1070, a tunnel diode and another germanium transistor in the time base A trigger circuit.
 
=== Rackmount Versions ===
Rackmount versions were also made, the RM585 and RM585A.
 
===Circuit Variants===
 
{| class="wikitable"
<!-- Header -->
! colspan="3" | Some changes across 585 and 585A
|-
!
! 585
! 585A
<!-- End Header -->
<!-- Start section -->
|-style="background-color:#ffffff;"
!  rowspan="2" | A-Trigger
| SN up to 1070
*[[6EW6]] Trigger comparator.
*[[6DJ8]] Trigger multivibrator
| rowspan="2" |
*Tunnel diode trigger
*PNP trigger amplifier [[2N2048]]
|-style="background-color:#ffffff;"
| SN 1071 up
*Tunnel diode trigger
*PNP trigger amplifier [[OC171]]
<!-- End Section -->
<!-- Start section -->
|-
!Sweep Generator
| Standard
| SN 120000 up
D152/252 added to [[6AL5]] disconnect diodes
<!-- End section -->
 
<!-- Start section -->
|-style="background-color:#ffffff;"
! rowspan="2"| 12.6 V Power
| SN up to 3762
*Used for plug-in
*Selenium rectifier
| rowspan="2" |
*Used for plug-in and vertical amplifier heaters
*SN 6580 up  Fused
|-style="background-color:#ffffff;"
| SN 3763 up 
*Used for plug-in and vertical amplifier heaters
*Minor design changes from earlier SN
<!-- End Section -->
 
<!-- Start section -->
|-
! rowspan="2"| Vertical amplifier
grid/plate line fuses
| SN up to 3762: No Fuse
| rowspan="2" |  Fused
|-
| SN 3763 up: Added F1210, F1260, F1285
<!-- End Section -->
<!-- Start section -->
|-style="background-color:#ffffff;"
! rowspan="2"| Delay Relay
| rowspan="2"|  [[6NO45]]
*Heater power from unregulated 18 V DC
* 33 Ω dropping resistor.
| SN up to 9179
*[[6NO45]]
*Heater power from unregulated 18 V DC
 
* 33 Ω dropping resistor.
|-style="background-color:#ffffff;"
| SN 9180 up
*[[18NO30]]
*Heater power from unregulated 18 V DC
|-
<!-- End Section -->
 
<!-- Start section -->
|-
! Trace Rotation
| Not present
| SN 9000 up: Added trace rotation
|-
<!-- End Section -->
 
<!-- Start section -->
|-style="background-color:#ffffff;"
! Final vertical power amp
|  [[6939]]/AX193/7699 dual tetrode
| 2 × [[7788]] Pentode
|-
<!-- End Section -->
 
<!-- Start section -->
|-
! Power supply Mod
| None
| SN 9250 up: Main relay K601-4 relocated [http://web.archive.org/web/20170727004536/http://www.reprise.com/host/tektronix/reference/581_relay.asp  Details]
|-
<!-- End Section -->
! colspan="3" |SN Range not applicable for rack-mount models
|-
|}
 
==Prices==
 
{| class="wikitable"
|-
| colspan="2" |  &nbsp;
| colspan="2" align="center" | 585
| colspan="5" align="center" | 585A
|-
! colspan="2" | Year
! 1959
! 1962
! 1963
! 1965
! 1969
! 1971*
! 1972*
|-
! rowspan="2"| mainframe only
| Catalog Price
|align=right|  $1,675
|align=right|  $1,725
|align=right|  $1,725
|align=right|  $1,725
|align=right|  $1,800
|align=right|  $2,400
|align=right|  $2,600
|-
| In 2023 Dollars
|align=right| $17,200
|align=right| $17,600
|align=right| $17,300
|align=right| $16,800
|align=right| $15,100
|align=right| $18,200
|align=right| $19,100
|-
! rowspan="2"| mainframe+[[80]]+[[P80]]
| Catalog Price
|align=right|  $1,825
|align=right|  $1,875
|align=right|  $1,975
|-
| In 2023 Dollars
|align=right| $19,300
|align=right| $19,100
|align=right| $19,900
|-
! rowspan="2"| mainframe+[[82]]
| Catalog Price
|
|
|
|align=right|  $2,375
|align=right|  $2,575
|align=right|  $3,325
|align=right|  $3,600
|-
| In 2023 Dollars
|
|
|
|align=right| $23,200
|align=right| $21,600
|align=right| $25,300
|align=right| $26,500
|-
!  rowspan="2"| mainframe+[[86]]+[[P6008]]
| Catalog Price
|
|
|
|align=right|  $2,075
|align=right|  $2,185
|
|
|-
| In 2023 Dollars
|
|
|
|align=right| $20,300
|align=right| $18,300
|
|
|}
 
:''* "limited demand" instrument''
 
 
==Pictures==
===585 non-A===
<gallery>
Tek-585-81-ca-front.jpg  | 585 with [[81|Type 81 Adapter]] and [[CA|Type CA plug-in]]
Tek-585-80.jpg          | 585 with [[80|Type 80 plug-in]]
Tek-585-82.jpg          | 585 with [[82|Type 82 plug-in]]
Tek 585 with 82.jpg      | 585 with [[82|Type 82 plug-in]]
Tek 585 non A Field Modification 040-275 label.jpg | Front panel label indicating Field Modification 040-275 is applied
</gallery>
===585 non-A Internals===
<gallery>
Tek585-bottom.jpg        | 585 bottom view (with [[81|Type 81 Adapter]] and [[CA|Type CA plug-in]])
Tek585-dl-driver-1.jpg  | Distributed delay line driver amplifier
Tek585-dl-driver-bot.jpg | Distributed delay line driver amplifier (bottom). Plug-in interface connector to the left.
Tek585-left-1.jpg        | 585 left side
Tek585-vert-1.jpg        | Vertical amplifier (post-delay 5-stage distributed amplifier). Pre-SN 2585 fixed termination.
Tek585-vert-2.jpg        | Vertical amplifier (5-stage dist amp, power output stage)
Tek585-rect.jpg          | Rectifiers
Tek585-tb-a.jpg          | Time Base A
Tek585-top-1.jpg        | 585 top view
Tek585-top-rear.jpg      | 585 rear from above, handle and HV cover removed
585 HV - Black Beauty.jpg| "[[Bumble Bee capacitors|Black Beauty]]" capacitors (leaky!) in original HV circuit
585 HV - recapped.jpg    | HV circuit re-capped with modern ceramic 10 nF / 3 kV caps
Tek-585-psu-2.jpg        | [[6080]] (large tube) and [[12B4]] pass elements in PSU
585-distamp-operating.jpg| 585 delay line driver distributed amplifier in operation
585-psu-operating.jpg    | 585 power supply (center) and timebase B (left) in operation
585-150ns-100hz.jpg      | 585 displaying a ~150 ns pulse at 100 Hz repetition rate at fastest timebase setting
585_cyclist.jpg          | Cyclist cartoon in horizontal amplifier schematic
Tek 585 lvps.png        | Tektronix 585 Low Voltage Power Supply Schematic
</gallery>
 
===585A===
<gallery>
Tek 585a trace.jpg
585a_front.jpg                          | 585A with [[82]]
Tek 585 upgraded to 585a.jpg            | 585 with TRIGGER SOURCE switch upgraded to 585A design
Wellenkino 585a 2.jpg
Wellenkino 585A.jpg
Tek 585a sine trace.jpg
Tek 585a square trace.jpg
Tek 585a with 81a and hickok plugin.jpg | 585A with [[81|81A]] and Hickok plug-in
Tek 585a handbook.jpg
</gallery>
===585A Internals===
<gallery>
Tek 585a right internal on cart.jpg | 585A on cart
585a_delay1.jpg                    | 585A delay line
585_delay2.jpg                      | 585A delay line
585_delay3.jpg                      | 585A delay line
585a_trig.jpg                      | 585A trigger circuit
585a_trig_td2.jpg                  | White plastic clip holds tunnel diode for triggering
585a_door_open.jpg                  | Inside view shows regulator tubes
585a_dist_vert amp.jpg              | Distributed vertical amplifier
T580_CRT.JPG                        | [[T581]]0P31 distributed deflection plates
Tek_154-0479-00-dDePlates.jpeg      | [[T581]]0P31 distributed deflection plates
Tek 58x direct crt.png              | Direct Connection to CRT (from 1964 Service Scope)
</gallery>
 
===RM585A===
<gallery>
Rm 585a.jpg|RM-585A
Tek_RM585A-Front.jpeg | RM585A - ALT/DLYD' Trigger
Tek_RM585A-Back.jpeg | RM585A - Rear
 
</gallery>
===RM585A Internals===
<gallery>
<gallery>
Image:585a_front.jpg|Front view.
Tek_RM585A_Int_LHSjpeg.jpeg                | RM585A Internal LHS
Image:585a_trig.jpg|585A trigger circuit.
Tek_RM585A_Int_Underside.jpeg              | RM585A Internal underside
Image:585a_trig_td2.jpg|White plastic clip holds tunnel diode for triggering.
Tek_RM585A_Int_Underside-TimeBaseOpen.jpeg | RM585A Internal Underside - Timebase  door open
Image:585a_door_open.jpg|Inside view shows regulator tubes.
Tek_RM585A_Int_Top-Dline-open.jpeg        | RM585A Top - Internal-  Delay line door open
Image:585a_dist_vert amp.jpg|Distributed vertical amplifier.
Tek_RM585A_Int_Top.jpeg                    | RM585A - Internal top
Image:Rm 585a.jpg|RM-585A
Tek_RM585A_Int_RHS.jpeg                    | RM585A Internal RHS
Tek_RM585A_Int_HV.jpeg                    | RM585A Internal HV Section
Tek_RM585A_Int_Rear.jpeg                  | RM585A Internal - Rear
Tek_585A_VOutput-Tubes.jpeg                | RM585A Internal - Vamp - Output [[7788]] pair
RM585A_12.6V-Recrifier.jpeg                | 12.6 V rail silicon diode rectifier with fuse
RM585A_T44-Trigger-Transformer.jpeg        | T44 - Trigger coupling transformer (Tunnel diode trigger)
RM585A_12.6V-regulator.jpeg                | 12.6 V rail regulator transistors
RM585A_18V-delayrelay.jpeg                | Delay relay 18NO30T
Tek_585A_Trigger-Amp-transistor.jpeg      | Trigger amplifier transistor 2N2048
Tek_585A_Vamp-Plate-Line-Termination.jpeg  | Plate line termination (post deflection plates)
Tek_585A_T1046-transformer.jpeg            | T1046 toroid transformer in V-amp, used as phase correction/common mode choke
Tek_585A_Grid_Line.jpeg                    | Tek 585A V-amp grid line (Delay Line driver stage)
Tek_585A_Plate_Line.jpeg                  | Tek 585A plate line  (partial, delay Line driver stage)
Tek_585A_Tunnel-trig.jpeg                  | Tunnel diode in A-trigger (closeup)
</gallery>
</gallery>
==Components==
{{Parts|585}}
{{Parts|585A}}
{{Plugins|580-series scopes}}
[[Category:580 series scopes]]
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