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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=High sensitivity amplifier | |series=500-series scopes | ||
image=Tek type l.jpg | | |type=Type L | ||
caption=Tektronix Type L | | |summary=High-sensitivity 30 MHz amplifier | ||
introduced=1957 | | |image=Tek type l front.jpg | ||
discontinued= | |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]]. | 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 | |||
Late versions have a [[ | [[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]]. | [[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== | ==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]] | [[Category:500 series plugins]] | ||
Latest revision as of 03:03, 10 March 2024
The Tektronix Type L is an amplifier plug-in for 500-series scopes. It was designed by Ron Olson.
The Type L is a Type K plus a 10x-gain AC-coupled preamp that extends the maximum sensitivity to 5 mV/div.
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
| Bandwidth | 30 MHz at 50 mV/div and above, 3 Hz – 24 MHz at 20 mV/div and below (in a 545) |
|---|---|
| Rise time | ≤6 ns at 50 mV/div and above, ≤10 ns at 20 mV/div and below |
| Deflection | 5 mV/Div to 20 V/Div, 1–2–5 |
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 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
Components
Some Parts Used in the L
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 12AT7 | 154-0039-00 | Vacuum Tube (Dual Triode) | dual high-gain triode | 161 • 180 • 310 • 310A • 315 • 316 • 360 • 502 • 502A • 511A • 512 • 513 • 513D • 514 • 514AD • 514D • 516 • 524 • 529 • RM529 • 544 • 546 • 547 • 556 • 565 • 570 • 3A2 • 75 • 3A75 • 1M1 • A • B • C • G • H • K • L • ML • M • N • K • R • S • Z • Keithley 610B |
| 12AU6 | 154-0040-00 | Vacuum Tube (Pentode) | RF pentode | 81 • 112 • 1L10 • 1L20 • 1L60 • 3L10 • 512 • 556 • 575 • 545 • 547 • 549 • 581 • 585 • A • B • C • G • K • H • L • ML • M • N • O • R • S • Z |
| 5654 | 154-0206-00 • 154-0084-00 | Vacuum Tube (Pentode) | RF pentode | B • L • ML |
| 6AK5 | 154-0014-00 • 154-0206-00 • 154-0084-00 | Vacuum Tube (Pentode) | RF pentode | B • C • CA • G • K • L • ML • S • Z • 517 • 517A • 524 |