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title=Tektronix Type L |
title=Tektronix Type L |
summary=High sensitivity amplifier plugin |
summary=High sensitivity amplifier plugin |
image=Tek type l.jpg |
image=Tek type l front.jpg |
caption=Tektronix Type L |
caption=Tektronix Type L |
introduced=1957 |
introduced=1957 |
discontinued=1972 |
discontinued=1973 |
series=[[500-series scopes]] |
series=[[500-series scopes]] |
manuals=
manuals=
* [http://w140.com/mmm/tek-l.pdf Tektronix Type L Manual (PDF)]
* [http://w140.com/mmm/tek-l.pdf Tektronix Type L Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_l_factory_cal_proc.pdf Tektronix Type L Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_fcp/tek_type_l_factory_cal_proc.pdf Tektronix Type L Factory Calibration Procedure (PDF)]
* [[Media:070-336.pdf|Tektronix Type L Manual (PDF, OCR, bad-OCR)]]
* [[Media:tek_type_l_fcp.pdf|Tektronix Type L Factory Calibration Procedure (PDF, OCR, bad-OCR)]]
}}
}}
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]].
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[[T|53/54T]] sweep plug-in.  It was renamed the Type L in 1959.
[[T|53/54T]] sweep plug-in.  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 1971 or 1972.
It was dropped after 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 [[Connectors#BNC|BNC connector]] instead of a [[Connectors#UHF|UHF connector]].
Late versions have a [[BNC connector]] instead of a [[UHF connector]].


[[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}}
{{MissingSpecs}}
==Internals==
The input is switched via a Frequency compensated attenuator network which is controlled by the Vols/CM Switch.
Input is then coupled to first cathode follower V5832, a 5654/6AK5W RF Pentode. This is configured as a cathode follower.
The screen supply of this  cathode follower is switched from +100 to a decoupled network from +225V rail when the X10 Mode is selected.
The output of input amplifier is then switched via a 10X Amplifier - if the X10 mode is selected in the front panel - or directly to the paraphase or phase inverter 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 10X amplifier stage is built with 3 5654/6AK5W tubes. First two are configured as amplifier and the last one as  output cathode follower.
Heater for the tubes are derived from +75VDC heater supply available at pin 15 of the connector. This is to avoid any  interference/hum from the regular AC heater supply at 60Hz.


==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
File:Tek type l perf.png | Performance in Different Scopes
Tek type l left.jpg
File:Tek type l schem.png | Schematic
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>
</gallery>


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

Revision as of 08:55, 16 November 2019

Template:Plugin Sidebar 2 The Tektronix Type L is an amplifier plug-in for 500-series scopes.

The Type L is a Type K plus a 10x-gain AC-coupled preamp 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 53/54T sweep plug-in. It was renamed the Type L in 1959. It was the fastest 5 mV plug-in until the 1A1 in 1964. It was dropped after 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.

Lavoie Laboratories produced an unauthorized clone, the LA-265-L.

Key Specifications

  • please add

Internals

The input is switched via a Frequency compensated attenuator network which is controlled by the Vols/CM Switch. Input is then coupled to first cathode follower V5832, a 5654/6AK5W RF Pentode. This is configured as a cathode follower. The screen supply of this cathode follower is switched from +100 to a decoupled network from +225V rail when the X10 Mode is selected.

The output of input amplifier is then switched via a 10X Amplifier - if the X10 mode is selected in the front panel - or directly to the paraphase or phase inverter 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 10X amplifier stage is built with 3 5654/6AK5W tubes. First two are configured as amplifier and the last one as output cathode follower.

Heater for the tubes are derived from +75VDC heater supply available at pin 15 of the connector. This is to avoid any interference/hum from the regular AC heater supply at 60Hz.

Pictures