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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]]. | |||
The Type L is a | 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 | |||
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 | It was the fastest 5 mV plug-in until the [[1A1]] in 1964. It was dropped after 1972. | ||
It was dropped after | |||
[[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 [[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> | <gallery> | ||
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> | </gallery> | ||
==Components== | |||
{{Parts|L}} | |||
[[Category:500 series plugins]] |