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|series=500-series scopes | |series=500-series scopes | ||
|type=Type L | |type=Type L | ||
|summary=High sensitivity amplifier | |summary=High-sensitivity 30 MHz amplifier | ||
|image=Tek type l front.jpg | |image=Tek type l front.jpg | ||
|caption=Tektronix Type L | |caption=Tektronix Type L | ||
| Line 10: | Line 10: | ||
|designers=Ron Olson | |designers=Ron Olson | ||
|manuals= | |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: | * [[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 | |||
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 1972. | |||
[[K]], L, and [[T]] are tied for longest production life, at 16 years. | [[K]], L, and [[T]] are tied for longest production life, at 16 years. | ||
| Line 34: | Line 34: | ||
[[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]]. | ||
{{ | {{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== | ==Internals== | ||
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network fed from the +225 V rail when the ×10 Mode is selected. | network fed from the +225 V rail when the ×10 Mode is selected. | ||
The output of input amplifier is then switched via a | The output of input amplifier is then switched via a ×10 amplifier (if ×10 mode is selected), | ||
directly to the | or directly to the phase inverter stage made up of two [[12AU6]] tubes. | ||
the input signal to a differential push-pull output. This output is passed to the final output drivers, | This stage converts the input signal to a differential push-pull output. | ||
which are two cathode follower sections with a pair of [[12AT7]] tubes. The differential output is then | This output is passed to the final output drivers, which are two cathode follower sections with a pair of [[12AT7]] tubes. | ||
passed to pin 1 and 3 of the connector to drive the vertical amplifier inside the chassis. | 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 | 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. | 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, | The diode D5972 on the first 5654/6AK5W amplifier tube's cathode (V5942) is used to protect the cathode bypass capacitor C5972, | ||
in which case the cathode bias of −150 V would come across C5972 and destroy it. | 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 | Heater supplies for the tubes are derived from the +75 V<sub>DC</sub> supply available at pin 15 of | ||
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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]] | ||