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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=High sensitivity amplifier plugin | | |series=500-series scopes | ||
image=Tek type l front.jpg | | |type=Type L | ||
caption=Tektronix Type L | | |summary=High sensitivity amplifier plugin | ||
introduced=1957 | | |image=Tek type l front.jpg | ||
discontinued=1973 | | |caption=Tektronix Type L | ||
|introduced=1957 | |||
manuals= | |discontinued=1973 | ||
|designers=Ron Olson | |||
|manuals= | |||
* [[Media:070-336.pdf|Tektronix Type L Manual]] (PDF, OCR) | |||
* [[Media:070-336.pdf|Tektronix Type L Manual (PDF, | |||
* [[Media:tek_type_l_fcp.pdf|Tektronix Type L Factory Calibration Procedure (PDF, OCR, bad-OCR)]] | * [[Media:tek_type_l_fcp.pdf|Tektronix Type L Factory Calibration Procedure (PDF, OCR, bad-OCR)]] | ||
* [[Media:Tek type l cal outline.pdf|Tektronix Type L Calibration Outline (PDF, 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]]. | ||
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It was dropped after 1972. | It was dropped after 1972. | ||
[[K]], | [[K]], L, and [[T]] are tied for longest production life, at 16 years. | ||
[[B]], [[D]], and [[G]] are next at 15 years. | [[B]], [[D]], and [[G]] are next at 15 years. | ||
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==Internals== | ==Internals== | ||
The input | 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 | 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 | The output of input amplifier is then switched via a 10× amplifier (if ×10 mode is selected) 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 ×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 for the tubes are derived from + | 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== | ||
Revision as of 03:43, 17 August 2021
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 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 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 ×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 VDC supply available at pin 15 of the mainframe interface, to avoid any mains interference/hum from the regular AC heater supply.
Pictures
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Type L in 541A
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Performance in Different Scopes
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Schematic
