585

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The Tektronix 585 is a 100 MHz 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 Type 80 plug-in and up to 85 MHz with the dual-channel 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.

Key Specifications

Rise time 3.5 ns with Type 80 plugin and P80 probe
Timebase A 50 ns/Div to 2 s/Div, 1−2−5, variable ×2.5, magnifier ×5, single sweep; X input
Timebase B 2 μs/Div to 1 s/Div, 1−2−5, can delay timebase A by 1 μs to 10 s
CRT T581, distributed vertical deflection plates, 10 kV acceleration
Outputs A Sawtooth, A Gate, B Gate, Calibrator (0.2 mV to 100 Vp-p, 1−2−5)
Power 107−127 or 214−234 VAC, 50-60 Hz, 890 VA / 710 W
Dimensions (W/L/H) 330×610×432 mm³ (13"×24"×17")

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

History

John Kobbe said:

Later on there was another special CRT designed with 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 active probe and plug in system left a lot to be desired. I wasn’t very proud of the 580 design as it was too compromised.

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 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 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 trigger amplifier made of a pair of 6EW6 miniature pentodes, followed by a Schmitt trigger made of a pair of miniature dual triode tubes.

Starting at serial number 1071 (and sometimes retrofitted to earlier instruments), the dual-triode Schmitt trigger circuit was replaced by an STD615 10 mA tunnel diode AC-coupled to the base-emitter junction of an OC171 germanium PNP transistor as a pulse amplifier.

The slower "B" timebase uses a Schmitt trigger circuit.

Vertical Signal Path

Like the 545, 551, and 555, the 585 uses two distributed amplifiers 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 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 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

Some changes across 585 and 585A
585 585A
A-Trigger SN up to 1070
  • 6EW6 Trigger comparator.
  • 6DJ8 Trigger multivibrator
  • Tunnel diode trigger
  • PNP trigger amplifier 2N2048
SN 1071 up
  • Tunnel diode trigger
  • PNP trigger amplifier OC171
Sweep Generator Standard SN 120000 up

D152/252 added to 6AL5 disconnect diodes

12.6 V Power SN up to 3762
  • Used for plug-in
  • Selenium rectifier
  • Used for plug-in and vertical amplifier heaters
  • SN 6580 up Fused
SN 3763 up
  • Used for plug-in and vertical amplifier heaters
  • Minor design changes from earlier SN
Vertical amplifier

grid/plate line fuses

SN up to 3762: No Fuse Fused
SN 3763 up: Added F1210, F1260, F1285
Delay Relay 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.
SN 9180 up
  • 18NO30
  • Heater power from unregulated 18 V DC
Trace Rotation Not present SN 9000 up: Added trace rotation
Final vertical power amp 6939/AX193/7699 dual tetrode 2 × 7788 Pentode
Power supply Mod None SN 9250 up: Main relay K601-4 relocated Details
SN Range not applicable for rack-mount models

Prices

  585 585A
Year 1959 1962 1963 1965 1969 1971* 1972*
mainframe only Catalog Price $1,675 $1,725 $1,725 $1,725 $1,800 $2,400 $2,600
In 2023 Dollars $17,200 $17,600 $17,300 $16,800 $15,100 $18,200 $19,100
mainframe+80+P80 Catalog Price $1,825 $1,875 $1,975
In 2023 Dollars $19,300 $19,100 $19,900
mainframe+82 Catalog Price $2,375 $2,575 $3,325 $3,600
In 2023 Dollars $23,200 $21,600 $25,300 $26,500
mainframe+86+P6008 Catalog Price $2,075 $2,185
In 2023 Dollars $20,300 $18,300
* "limited demand" instrument


Pictures

585 non-A

585 non-A Internals

585A

585A Internals

RM585A

RM585A Internals


Components

Some Parts Used in the 585

Part Part Number(s) Class Description Used in
120-0141-00 120-0141-00 Discrete component power transformer 581 581A 585 585A
12AU6 154-0040-00 Vacuum Tube (Pentode) RF pentode 81 112 1L10 1L20 1L60 3L10 512 556 575 545 547 549 581 585 A B C G K H L M N O R S Z
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12AX7 154-043 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 513 524 531 531A 535 536 545 545A 545B 546 547 549 555 570 581 581A 585 585A E Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A
18NO30 Discrete component 18 V, 30-second delay relay 581 585
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 316 317 360 453 502 502A 503 504 506 513 515 516 524 529 RM529 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 310 310A 502 503 504 511A 512 516 517 524 526 531 531A 535 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6939 Vacuum Tube (Dual Tetrode) dual tetrode 581 585
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 516 517 517A 531 535 541 535 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
6CY5 154-0207-00 Vacuum Tube (Tetrode) tetrode 581 585 581A 585A
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 132 360 51 527 581 581A 585 585A 3T77 3T77A
6NO45 Discrete component 6.3 V / 500 mA, 45-second delay relay 581 585
7699 Vacuum Tube (Dual Tetrode) dual tetrode 581 585
NE-2 150-002 150-0002-00 Gas Discharge Tube (Neon lamp) Neon lamp 511 511A 581 581A 585 585A 545A TU-4
OC171 152-0102-00 Discrete component Germanium PNP transistor 581 585
STD615 152-0102-00 Discrete component 10 mA, 28 pF germanium tunnel diode 581 585 TU-5
T581 154-0224-00 154-0228-00 154-0229-00 154-0230-00 154-0297-00 154-0354-00 154-0396-00 154-0435-00 154-0445-00 154-0446-00 154-0479-00 154-0479-01 154-0479-02 CRT CRT 581 585


Some Parts Used in the 585A

Part Part Number(s) Class Description Used in
120-0141-00 120-0141-00 Discrete component power transformer 581 581A 585 585A
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12AX7 154-043 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 513 524 531 531A 535 536 545 545A 545B 546 547 549 555 570 581 581A 585 585A E Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A
1N3848 152-0140-00 Discrete component 10 mA, 25 pF tunnel diode 581A 585A RM585A 7B52 S-53
2N2048 151-076 151-0076-00 Discrete component germanium PNP switching transistor 585A
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 316 317 360 453 502 502A 503 504 506 513 515 516 524 529 RM529 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 310 310A 502 503 504 511A 512 516 517 524 526 531 531A 535 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 516 517 517A 531 535 541 535 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
6CY5 154-0207-00 Vacuum Tube (Tetrode) tetrode 581 585 581A 585A
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 132 360 51 527 581 581A 585 585A 3T77 3T77A
7788 154-0420-00 Vacuum Tube (Pentode) long life, shock and vibration resistant pentode 529 RM529 581A 585A RM581 RM585 Telequipment D56
8426 Vacuum Tube (Pentode) RF pentode O 545A 547 549 581A 585A
NE-2 150-002 150-0002-00 Gas Discharge Tube (Neon lamp) Neon lamp 511 511A 581 581A 585 585A 545A TU-4
SMTD995 152-0140-01 Discrete component 10 mA, 8 pF tunnel diode 1S1 1S2 1502 21A 22A 3T5 3T6 475 475A 475M 544 R544 546 RM546 547 RM547 556 R556 581A 585A RM585 7B52 7B53N 7B70 7B71 7D10 7D11 7T11 7T11A R7912 S-51 S-52 TU-5 067-0572-00 067-0572-01 067-0681-00
T5810 154-0479-00 154-0479-01 154-0479-02 CRT CRT 581A 585A


Some Plugins compatible with 580-series scopes

Page Manufacturer Model Description Introduced Discontinued
80 Tektronix 80 vertical amplifier 1959 (?)
81 Tektronix Type 81 plug-in adapter 1960 1972
82 Tektronix 82 85 MHz dual-trace amplifier 1962 1972
84 Tektronix 84 calibration fixture 1962 (?)
86 Tektronix 86 vertical amplifier 1963 1972
TU-3 Tektronix calibration fixture (?) (?)