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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= | 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)]] | |||
* [[Media:Tek type l cal outline.pdf|Tektronix Type L Calibration Outline (PDF, 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 | 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]]. | Late versions have a [[BNC connector]] instead of a [[UHF connector]]. | ||
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{{MissingSpecs}} | {{MissingSpecs}} | ||
==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 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== | ||
<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> | ||
[[Category:500 series plugins]] | [[Category:500 series plugins]] | ||