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Tektronix Type W

8-23 MHz differential comparator

Compatible with 500-series scopes

Produced from 1965 to 1974

Manuals

Tektronix Type W Manual (11MB)
Tektronix Type W Schematics Color for SN 3270 up (10MB)
Tektronix Type W SN 7000-up Manual (OCR)
Tektronix Type W Factory Calibration Procedure, January 1969 (OCR)
Tektronix Type W Factory Calibration Procedure, March 1969 (OCR)
Tektronix Type W Calibration Outline (OCR)

(All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix Type W is a differential comparator plug-in amplifier for 500-series scopes, designed by John Horn.

Key Specifications

Deflection	1 mV/Div to 50 V/Div, 1–2–5 (6-position) and 4-position decade attenuator
Input impedance	1 MΩ // 20 pF (either input)
Bandwidth	26 MHz (23 MHz below S/N 7000) @ 50 mV/cm; 8 MHz @ 1 mV/cm
Common Mode Range	±15 V after INPUT ATTEN
CMRR	DC Coupled: 20000:1 DC to 20 kHz, 500:1 at 500 kHz; AC Coupled: 1000:1 at 60 Hz
Signal ranges

Maximum Input Voltage (S/N 7000-up)
DC Coupled	350 V
AC Coupled	500 V
Maximum Input Voltage (S/N 101-6999)
INPUT ATTEN = 1	15 V
INPUT ATTEN = 10	150 V
INPUT ATTEN = 100	±350 V (DC Coupled); 500 V (AC Coupled)
INPUT ATTEN = 1000	±350 V (DC Coupled); 500 V (AC Coupled)

Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) than its Type Z predecessor, and it extends performance in terms of sensitivity, reaching 1 mV/div. It achieves 20,000 to 1 common-mode rejection at DC and low frequencies.

Links

Documents Referencing W

Document	Class	Title	Authors	Year	Links
Tekscope 1970 V2 N5 Oct 1970.pdf	Article	Amplitude Measurement to Better Than 1%		1970	1S1 • 7503 • 7A13 • 1A5 • W • 3A7
Tekscope 1972 V4 N5 Sep 1972.pdf	Article	A Practical Approach to Differential Amplifiers and Measurements	Fred Beckett	1972	112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z
Tekscope 1972 V4 N6 Nov 1972.pdf	Article	Differential Amplifiers and Measurements, Part 2	Fred Beckett	1972	112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z

Calibration Fixture

067-0503-00 Precision DC Divider, 10x & 100x

Operation

Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V_C", which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V. A mode switch selects between displaying A−V_C, A−B, or V_C−B. The "A−B" mode is particularly useful for displaying the current in a sense resistor, while the other modes provide "slideback" measurements of small variations superimposed on a large constant. An output of V_C is provided on the front panel for precision measurements.

Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector, reminiscent of Type D from ten years before.

Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel. (Types 1A5 and 1A7 have an internal jumper that can be cut.)

Early production Type W in a 556 mainframe won't meet spec for overdrive recovery time, because an overdriven W passes enough common-mode to the mainframe vertical amp to saturate it. At S/N 3270, this was fixed, by adding another stage to attenuate CM. The new "output amp" circuit board clips onto the rear bulkhead; significant hand mods are required on the chassis. This was also offered as Modification kit 040-0447-00 to retrofit existing instruments.

Type W was created with a pair of type 8056 Nuvistors in the front end. In 1971 (S/N 7000), following the lead of Type 1A7, the Nuvistors were replaced by JFETs to reduce drift. Mod kit 040-0590-00 was offered for existing instruments.

In the letter-series timeline of differential comparators, Type W, introduced in 1965, follows Type Z and precedes Type 1A5.

Type W uses three type 8416 tubes, the 12V version of the 6DJ8.

Pictures

Front View
Right View
Left View
Top View
Bottom View
Block Diagram
Front view.
Top-left view.
Bottom view.
Differential Comparator, initial version
Input Attenuators
Switching Diagram
A-phase (prototype) Type W
A-phase (prototype) Type W
A-phase (prototype) Type W
A-phase (prototype) Type W
A-phase (prototype) Type W

Components

Some Parts Used in the W

Part	Part Number(s)	Class	Description	Used in
6DJ8	154-0187-00 • 154-0305-00	Vacuum Tube (Dual Triode)	dual triode	067-506 • 111 • 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
8056	154-0417-00	Vacuum Tube (Triode)	low-voltage Nuvistor triode	422 • 502 • W • 1S1 • 3A7 • 3S3 • 3T4 • 5T3 • 10A1
8416	154-0413-00 • 157-0116-00	Vacuum Tube (Dual Triode)	dual triode	1S1 • 2A61 • 3A8 • 3L5 • W

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar 2 |
+{{Plugin Sidebar
-title=Tektronix Type W |
+|manufacturer=Tektronix
-summary=8-23 MHz differential comparator |
+|series=500-series scopes
-image=type w front.jpg |
+|type=Type W
-caption=Type W front view|
+|summary=8-23 MHz differential comparator
-introduced=1965 |
+|image=Tek_Type_W_Front–Tight.jpg
-discontinued=1974 |
+|caption=Type W front view
-series=[[500-series scopes]]|
+|introduced=1965
-manuals=
+|discontinued=1974
-* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]
+|designers=John Horn
-* [[Media:070-432.pdf|Tektronix Type W Manual (11MB, PDF)]]
+|manuals=
-* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]
+* [[Media:070-432.pdf|Tektronix Type W Manual]] (11MB)
-* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969 (PDF, needs OCR)]]
+* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up]] (10MB)
-* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969 (PDF, needs OCR)]]
+* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual]] (OCR)
-<!-- * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]] -->
+* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969]] (OCR)
+* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969]] (OCR)
+* [[Media:Tek type w cal outline.pdf|Tektronix Type W Calibration Outline]] (OCR)
+<!--
+ * [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]
+ * [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]
+ * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]]
+-->
 }}
-The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]].
+The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]], designed by [[John Horn]].
-Its bandwidth varies from 23 MHz to 8 MHz depending on gain.  Only modestly
-faster than its [[Z|Type Z]] predecessor, Type W extends performance in
-terms of sensitivity, reaching 1 mV/div, and achieves 20,000 to 1 common-mode
-rejection at DC and low frequencies.
+{{BeginSpecs}}
+{{Spec | Deflection        | 1 mV/Div to 50 V/Div, 1–2–5 (6-position) and 4-position decade attenuator }}
+{{Spec | Input impedance   | 1 MΩ // 20 pF (either input) }}
+{{Spec | Bandwidth         | 26 MHz (23 MHz below S/N 7000) @ 50 mV/cm;  8 MHz @ 1 mV/cm }}
+{{Spec | Common Mode Range | ±15 V after INPUT ATTEN }}
+{{Spec | CMRR              | DC Coupled: 20000:1 DC to 20 kHz, 500:1 at 500 kHz; AC Coupled: 1000:1 at 60 Hz }}
+{{Spec | Signal ranges     | }}
+{| class="wikitable" border=1 style="margin-left: 8em;" |
+!Maximum Input Voltage (S/N 7000-up)
+|-
+| DC Coupled || 350 V
+|-
+| AC Coupled || 500 V
+|-
+!Maximum Input Voltage (S/N 101-6999)
+|-
+| INPUT ATTEN = 1 || 15 V
+|-
+| INPUT ATTEN = 10 || 150 V
+|-
+| INPUT ATTEN = 100 || ±350 V (DC Coupled); 500 V (AC Coupled)
+|-
+| INPUT ATTEN = 1000 || ±350 V (DC Coupled); 500 V (AC Coupled)
+|-
+|}
+Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) than its [[Z|Type Z]] predecessor, and it extends performance in terms of sensitivity, reaching 1 mV/div.
+It achieves 20,000 to 1 common-mode rejection at DC and low frequencies.
+{{EndSpecs}}
+==Links==
+{{Documents|Link=W}}
+==Calibration Fixture==
+:[[067-0503-00]] Precision DC Divider, 10x & 100x
+==Operation==
 Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>",
 which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V.
@@ Line 28: / Line 69: @@
 An output of V<sub>C</sub> is provided on the front panel for precision measurements.
-Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector,
+Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector, reminiscent of [[D|Type D]] from ten years before.
-reminiscent of [[D|Type D]] from ten years before.
 Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel.
-([[1A5|Type 1A5]] has an internal jumper that can be cut.)
+(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.)
-Original production uses a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end; starting at serial number 7000 these were replaced with JFETs.
+Early production Type W in a [[556]] mainframe won't meet spec for overdrive recovery time, because an overdriven W passes enough common-mode to the mainframe vertical amp to saturate it.
+At S/N 3270, this was fixed, by adding another stage to attenuate CM. The new "output amp" circuit board clips onto the rear bulkhead; significant hand mods are required on the chassis.
+This was also offered as Modification kit 040-0447-00 to retrofit existing instruments.
-In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]],
+Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end.  In 1971 (S/N 7000), following the lead of Type [[1A7]], the Nuvistors were replaced by JFETs to reduce drift.
-follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].
+Mod kit 040-0590-00 was offered for existing instruments.
+In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].
-==Specifications==
+Type W uses three type [[8416]] tubes, the 12V version of the [[6DJ8]].
-[[Category:Specifications needed]] ''please add''
 ==Pictures==
 <gallery>
+Tek_Type_W_Front.jpg|Front View
+Tek_Type_W_Right.jpg|Right View
+Tek_Type_W_Left.jpg|Left View
+Tek_Type_W_Top.jpg|Top View
+Tek_Type_W_Bottom.jpg|Bottom View
+Tek w block.png|Block Diagram
 Type_w_front.jpg|Front view.
 Type_w_topleft.jpg|Top-left view.
 Type_w_bottom.jpg|Bottom view.
-Tek w block.png|Block Diagram
+Tek w differential comparator.png|Differential Comparator, initial version
-Tek w differential comparator.png|Differential Comparator
 Tek w input attenuators.png|Input Attenuators
 Tek w switching diagram.png|Switching Diagram
@@ Line 57: / Line 106: @@
 Tek type w a phase 5.jpg|A-phase (prototype) Type W
 </gallery>
+==Components==
+{{Parts|W}}
 [[Category:500 series plugins]]
+[[Category:Differential amplifiers]]