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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix Type L |
|manufacturer=Tektronix
summary=High sensitivity amplifier plugin |
|series=500-series scopes
image=type L front.jpg |
|type=Type L  
caption=Tektronix Type L |
|summary=High-sensitivity 30 MHz amplifier  
introduced=1957 |
|image=Tek type l front.jpg  
discontinued=1972 |
|caption=Tektronix Type L  
series=[[500-series scopes]] |
|introduced=1957  
manuals=
|discontinued=1973
* [http://w140.com/mmm/tek-l.pdf Tektronix Type L Manual (PDF)]
|designers=Ron Olson
* [http://w140.com/tek_fcp/tek_type_l_factory_cal_proc.pdf Tektronix Type L Factory Calibration Procedure (PDF)]
|manuals=
* [[Media:070-336.pdf|Tektronix Type L Manual]] (OCR)
* [[Media:tek_type_l_fcp.pdf|Tektronix Type L Factory Calibration Procedure]] (bad-OCR)
* [[Media:Tek type l cal outline.pdf|Tektronix Type L Calibration Outline]] (OCR)
<!--
* [https://w140.com/mmm/tek-l.pdf Tektronix Type L Manual (PDF)]
* [https://w140.com/tek_fcp/tek_type_l_factory_cal_proc.pdf Tektronix Type L Factory Calibration Procedure (PDF)]
-->
}}
}}
The '''Tektronix Type L''' is an amplifier plug-in for [[500-series scopes]].
The '''Tektronix Type L''' is an amplifier plug-in for [[500-series scopes]].
It was designed by [[Ron Olson]].


The Type L is a [[K|Type K]] plus a 10x-gain AC-coupled preamp
The Type L is a [[K|Type K]] plus a 10x-gain AC-coupled preamp that extends the maximum sensitivity to 5 mV/div.
that extends the maximum sensitivity to 5 mV/div.
Bandwidth in a [[545]] is 30 MHz at 50 mV/div and above, 3 Hz-24 MHz at 20 mV/div and below.


Type 53/54L was [[introduced in 1957]] along with the [[536]] and its companion
Type 53/54L was [[introduced in 1957]] along with the [[536]] and its companion [[T|53/54T]] sweep plug-in.   
[[T|53/54T]] sweep plug-in.  It was renamed the Type L in 1959.
It was renamed the Type L in 1959.
It was the fastest 5 mV plug-in until the [[1A1]] in 1964.
It was the fastest 5 mV plug-in until the [[1A1]] in 1964. It was dropped after 1972.
It was dropped after 1971 or 1972.
 
[[K]], L, and [[T]] are tied for longest production life, at 16 years.
[[B]], [[D]], and [[G]] are next at 15 years.


Late versions have a [[BNC connector]] instead of a [[UHF connector]].
Late versions have a [[BNC connector]] instead of a [[UHF connector]].
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[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-L|LA-265-L]].
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-L|LA-265-L]].


{{MissingSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth  | 30 MHz at 50 mV/div and above, 3 Hz – 24 MHz at 20 mV/div and below (in a [[545]]) }}
{{Spec | Rise time  | ≤6 ns at 50 mV/div and above, ≤10 ns at 20 mV/div and below }}
{{Spec | Deflection | 5 mV/Div to 20 V/Div, 1–2–5 }}
{{EndSpecs}}
 
==Internals==
 
The input signal traverses a frequency-compensated attenuator network controlled by the Volts/cm switch,
and is then coupled to the first cathode follower tube (V5832), a [[5654]]/[[6AK5W]] RF pentode.
The screen supply of this cathode follower is switched from +100 V to a decoupling
network fed from the +225 V rail when the ×10 Mode is selected.
 
The output of input amplifier is then switched via a ×10 amplifier (if ×10 mode is selected),
or directly to the phase inverter stage made up of two [[12AU6]] tubes.
This stage converts the input signal to a differential push-pull output.
This output is passed to the final output drivers, which are two cathode follower sections with a pair of [[12AT7]] tubes.
The differential output is then passed to pin 1 and 3 of the connector to drive the vertical amplifier inside the chassis.
 
The ×10 amplifier stage is built with three 5654/6AK5W tubes, the first two of which are configured as
amplifiers, and the last one as an output cathode follower.
The diode D5972 on the first 5654/6AK5W amplifier tube's cathode (V5942) is used to protect the cathode bypass capacitor C5972,
a 500 μF/6 V electrolytic, in case someone would pull out V5942 with power applied, in which case the cathode bias of −150 V
would come across C5972 and destroy it. 
 
Heater supplies for the tubes are derived from the +75 V<sub>DC</sub> supply available at pin 15 of
the mainframe interface, to avoid any mains interference/hum from the regular AC heater supply.


==Pictures==
==Pictures==


<gallery>
<gallery>
File:Tek type l.jpg
type L front.jpg
File:Tek type l top.jpg
Tek type l.jpg
File:Tek type l left.jpg
Tek type l top.jpg
Tek type l left.jpg
Tek type l bottom.jpg
Tek type l bottom.jpg
Tek type l top2.jpg
Tek type l in 541a.jpg|Type L in [[541|541A]]
File:Tek type l perf.png | Performance in Different Scopes
Tek type l perf.png | Performance in Different Scopes
File:Tek type l schem.png | Schematic
Tek type l schem.png | Schematic
</gallery>
</gallery>
==Components==
{{Parts|L}}


[[Category:500 series plugins]]
[[Category:500 series plugins]]
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