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The Type M is a four-channel plug-in for [[500-series scopes]]. 
{{Plugin Sidebar
Early versions had UHF connectors for the inputs. 
|manufacturer=Tektronix
Later versions have BNC connectors for the inputs. 
|series=500-series scopes
The risetime is 17 nanoseconds, bandwidth is DC to 20MHz.
|type=Type M
Maximum sensitivity is 20mV/div.
|summary=20 MHz quad-channel amplifier
Each channel can be AC or DC coupled, inverted or straight, or disabled entirely.  The enabled channels can
|image=Type m front.jpg
operate in CHOP or ALT mode.
|caption=Type M front view
|introduced=1962
|discontinued=1973
|designers=Oz Svehaug;Glenn Parks
|manuals=
* [[Media:070-295.pdf|Tektronix Type M Manual]] (OCR)
* [[Media:tek_type_m_fcp.pdf|Tektronix Type M Factory Calibration Procedure]] (OCR)
* [[Media:Tek type m cal outline.pdf|Tektronix Type M Calibration Outline]] (OCR)
<small>
'''Alternate copies'''
* [https://bama.edebris.com/manuals/tek/m/ Tektronix Type M Manual]] (DjVu @ BAMA)
</small>
}}
The '''Tektronix Type M''' is a four-channel plug-in for [[500-series scopes]] that was [[introduced in 1962]], along with the [[O|Type O]], and dropped after 1972.
It was designed by [[Oz Svehaug]] and [[Glenn Parks]].


Each input goes through a step attenuator, is clamped by a neon bulb,  
Early versions had [[UHF connector]]s, later versions have [[BNC connector]]s for the inputs.
and then is fed to the grid of a cathode follower made with a [[7586]] Nuvistor tube.   
 
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 20 MHz }}
{{Spec | Rise time | 17 ns }}
{{Spec | Deflection | 20 mV/div to 10 V/div, 1–2–5 }}
{{Spec | Modes | Each channel can be AC or DC coupled, inverted or straight, or disabled entirely. The enabled channels can operate in CHOP or ALT mode. }}
{{EndSpecs}}
 
==Internals==
Each input goes through a step attenuator, is clamped by a neon bulb, and then is fed to the grid of a cathode follower made with a [[7586]] Nuvistor tube.   
Next, the signal goes to a PNP differential amplifier.   
Next, the signal goes to a PNP differential amplifier.   
Diodes in series with the collector signal of this differential amplifier are used for input channel switching.
Diodes in series with the collector signal of this differential amplifier are used for input channel switching.
An internal differential signal bus connects the switched outputs of each of the input channels  
An internal differential signal bus connects the switched outputs of each of the input channels and feeds the signal to the output amplifier,  
and feeds the signal to the output amplifier, which drives the signal output, pins 1 and 3 of the plug-in connector.   
which drives pins 1 and 3 of the [[500-series plug-in connector]].   
The output amplifier is two [[12AU6]] pentodes connected as a differential amplifier,  
The output amplifier is two [[12AU6]] pentodes connected as a differential amplifier,  
followed by a [[12AT7]] dual triode acting as a cathode follower to drive the output with a relatively low impedance.
followed by a [[12AT7]] dual triode acting as a cathode follower to drive the output with a relatively low impedance.


Type M was introduced in 1962, along with Type [[O]], and dropped after 1971 or 1972.
==Pictures ==
<gallery>
Type_m_front.jpg|Late Type M Front view
Type_m_left.jpg|Late Type M Left view
Type_m_right.jpg|Late Type M Right view
Tek_early_m_front.jpg|Early Type M Front
Tek early m left.jpg|Early Type M Left
Tek early m right.jpg|Early Type M Right
Tek m 501 1.jpg
Tek m 501 2.jpg
Tek m 501 3.jpg
Tek m 501 4.jpg
Tek m 501 5.jpg
Tek m 501 6.jpg
Tek m mod210d.jpg|Type M Mod 210D
Type m chan switching low sn.png|Channel Switching Schematic, SN 824 and below
Type m chan switching sn 825-up.png|Channel Switching Schematic, SN 825 and above
Type m 4 chan switched amp low sn.png|Four Channel Switched Amplifier Schematic, SN 2759 and below
Type m 4 chan switched amp sn 2760-up.png|Four Channel Switched Amplifier Schematic, SN 2760 and above
tek_type_m_in_556.jpg|Type M in [[556]]
</gallery>


* http://bama.edebris.com/manuals/tek/m/
==Components==
* http://w140.com/tek_fcp/tek_type_m_factory_cal_proc.pdf
{{Parts|M}}


<gallery>
[[Category:500 series plugins]]
Image:Type_m_front.jpg|Front view.
Image:Type_m_right.jpg|Right view
Image:Type_m_left.jpg|Left view.
</gallery>

Latest revision as of 08:19, 6 December 2023

Tektronix Type M
20 MHz quad-channel amplifier
Type M front view

Compatible with 500-series scopes

Produced from 1962 to 1973

Manuals

Alternate copies

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type M is a four-channel plug-in for 500-series scopes that was introduced in 1962, along with the Type O, and dropped after 1972. It was designed by Oz Svehaug and Glenn Parks.

Early versions had UHF connectors, later versions have BNC connectors for the inputs.

Key Specifications

Bandwidth DC to 20 MHz
Rise time 17 ns
Deflection 20 mV/div to 10 V/div, 1–2–5
Modes Each channel can be AC or DC coupled, inverted or straight, or disabled entirely. The enabled channels can operate in CHOP or ALT mode.

Internals

Each input goes through a step attenuator, is clamped by a neon bulb, and then is fed to the grid of a cathode follower made with a 7586 Nuvistor tube. Next, the signal goes to a PNP differential amplifier. Diodes in series with the collector signal of this differential amplifier are used for input channel switching. An internal differential signal bus connects the switched outputs of each of the input channels and feeds the signal to the output amplifier, which drives pins 1 and 3 of the 500-series plug-in connector. The output amplifier is two 12AU6 pentodes connected as a differential amplifier, followed by a 12AT7 dual triode acting as a cathode follower to drive the output with a relatively low impedance.

Pictures

  • Late Type M Front view

    Late Type M Front view

  • Late Type M Left view

    Late Type M Left view

  • Late Type M Right view

    Late Type M Right view

  • Early Type M Front

    Early Type M Front

  • Early Type M Left

    Early Type M Left

  • Early Type M Right

    Early Type M Right

  • Type M Mod 210D

    Type M Mod 210D

  • Channel Switching Schematic, SN 824 and below

    Channel Switching Schematic, SN 824 and below

  • Channel Switching Schematic, SN 825 and above

    Channel Switching Schematic, SN 825 and above

  • Four Channel Switched Amplifier Schematic, SN 2759 and below

    Four Channel Switched Amplifier Schematic, SN 2759 and below

  • Four Channel Switched Amplifier Schematic, SN 2760 and above

    Four Channel Switched Amplifier Schematic, SN 2760 and above

  • Type M in 556

    Type M in 556

Components

Some Parts Used in the M

Part Part Number(s) Class Description Used in
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 • 180 • 310 • 310A • 315 • 316 • 360 • 502 • 502A • 511A • 512 • 513 • 513D • 514 • 514AD • 514D • 516 • 524 • 529 • RM529 • 544 • 546 • 547 • 556 • 565 • 570 • 3A2 • 75 • 3A75 • 1M1 • A • B • C • G • H • K • L • ML • M • N • K • R • S • Z
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 • ML • M • N • O • R • S • Z
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311
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