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The Type M is a four-channel letter-series plug-in. Early models had UHF connectors for the inputs.  Later models have BNC connectors for the inputs.
{{Plugin Sidebar 2 |
title=Tektronix Type M|
summary=20 MHz quad channel amplifier|
image=Type m front.jpg |
caption=Type M front view|
introduced=1962 |
discontinued=1973 |
series=[[500-series scopes]]|
manuals=
* [http://w140.com/mmm/tek-m.pdf Tektronix Type M Manual (PDF)]
* [http://bama.edebris.com/manuals/tek/m/ Tektronix Type M Manual (BAMA)]
<!-- * [http://w140.com/tek_fcp/tek_type_m_factory_cal_proc.pdf Tektronix Type M Factory Calibration Procedure (PDF)] -->
 
* [[Media:070-295.pdf|Tektronix Type M Manual (PDF, OCR, bad-OCR)]]
* [[Media:tek_type_m_fcp.pdf|Tektronix Type M Factory Calibration Procedure (PDF, OCR)]]
* [[Media:Tek type m cal outline.pdf|Tektronix Type M Calibration Outline (PDF, OCR)]]
}}
The '''Tektronix Type M''' is a four-channel plug-in for [[500-series scopes]].
It was designed by [[Oz Svehaug]] and [[Glenn Parks]].
Early versions had [[UHF connector]]s for the inputs.   
Later versions have [[BNC connector]]s for the inputs.
 
Type M was [[introduced in 1962]], along with the [[O|Type O]], and dropped after 1972.
 
{{MissingSpecs}}
 
The risetime is 17 nanoseconds, bandwidth is DC to 20 MHz.
Maximum sensitivity is 20 mV/div.
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 ==
 
<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>
 
[[Category:500 series plugins]]

Revision as of 11:14, 5 May 2021

Template:Plugin Sidebar 2 The Tektronix Type M is a four-channel plug-in for 500-series scopes. It was designed by Oz Svehaug and Glenn Parks. Early versions had UHF connectors for the inputs. Later versions have BNC connectors for the inputs.

Type M was introduced in 1962, along with the Type O, and dropped after 1972.

Key Specifications

  • please add

The risetime is 17 nanoseconds, bandwidth is DC to 20 MHz. Maximum sensitivity is 20 mV/div. 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