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-The Tektronix Type L is plug-in for [[500-series scopes]].
+{{Plugin Sidebar
+|manufacturer=Tektronix
+|series=500-series scopes
+|type=Type L
+|summary=High-sensitivity 30 MHz amplifier
+|image=Tek type l front.jpg
+|caption=Tektronix Type L
+|introduced=1957
+|discontinued=1973
+|designers=Ron Olson
+|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]].
+It was designed by [[Ron Olson]].
-Type L is a 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 5mV/div.
-Bandwidth in a 545 is 30MHz at 50mV/div and above, 3Hz-24MHz at 20mV/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.
-/54[[T]] sweep plugin.  It was renamed Type L in 1959.
+It was renamed the Type L in 1959.
-It was the fastest 5mV plugin 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.
-Late versions have a BNC connector instead of UHF.
+[[K]], L, and [[T]] are tied for longest production life, at 16 years.
+[[B]], [[D]], and [[G]] are next at 15 years.
-* http://bama.edebris.com/manuals/tek/l/
+Late versions have a [[BNC connector]] instead of a [[UHF connector]].
-* http://w140.com/tek_fcp/tek_type_l_factory_cal_proc.pdf
+[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-L|LA-265-L]].
+{{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==
 <gallery>
-Image:Tek type l.jpg
+type L front.jpg
+Tek type l.jpg
+Tek type l top.jpg
+Tek type l left.jpg
+Tek type l bottom.jpg
+Tek type l in 541a.jpg|Type L in [[541|541A]]
+Tek type l perf.png | Performance in Different Scopes
+Tek type l schem.png | Schematic
 </gallery>
+==Components==
+{{Parts|L}}
+[[Category:500 series plugins]]