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The Tektronix Type H is a single-channel plug-in for [[500-series scopes]]. It provides two
{{Plugin Sidebar | designers=|
inputs and has a switch to select between them. The rise time of the plug-in is 20 nanoseconds; bandwidth is 15MHz.
manufacturer=Tektronix | type=Type H |
The sensitivity ranges from 5mV/cm to 20V/cm. A compromise, Type H is not as fast as Type [[B]], but it is DC-coupled on all ranges.
summary=15 MHz amplifier plug-in |
Later Type H's use a [[Turret attenuators|turret attenuator]].  
series=500-series scopes |
Type H with S/N less than 10,000 have ordinary attenuator.
image=Tek type h early.jpeg |
caption=Tek Type H |
introduced=1958 |
discontinued=1971 |
manuals=
* [[Media:110-008.pdf|Tektronix Type H Manual]] (110-008, sn 1102, PDF)
* [[Media:070-272.pdf|Tektronix Type H Manual]] (later, 070-272, PDF, OCR)
* [[Media:tektronix_type_h_schem.pdf|Tektronix Type H Schematics Only (PDF, OCR, bad-OCR)]]
* [[Media:tek_type_h_fcp.pdf|Tektronix Type H Factory Calibration Procedure (PDF, OCR)]]
<!-- * [https://w140.com/tek_type_h_schematics.pdf Tektronix Type H Schematics Only (PDF)] -->
}}
The '''Tektronix Type H''' is a single-channel, 15 MHz plug-in for [[500-series scopes]].
It provides two inputs and has a switch to select between them.


A design compromise, Type H is not as fast as [[B|Type B]], but it is DC-coupled on all ranges.


Type 53/54H was [[introduced in 1958]], along with the [[533]] and [[543]], renamed Type H in 1959, and dropped after 1970.
Type 53/54H was [[introduced in 1958]], along with the [[533]] and [[543]], renamed Type H in 1959, and dropped after 1970.


* [http://w140.com/tek_type_h_ocr.pdf Tektronix Type H Manual (PDF)]
The turret attenuator was designed by [[Lang Hedrick]]'s group.
* [http://w140.com/tek_type_h_schematics.pdf Tektronix Type H Schematics Only (PDF)]
* [http://w140.com/tek_fcp/tek_type_h_factory_cal_proc.pdf Tektronix Type H Factory Calibration Procedure (PDF)]


[[list of manuals that are needed|Manual needed]] (complete).
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 15 MHz }}
{{Spec | Rise time | 20 ns }}
{{Spec | Deflection | 5 mV/cm to 20 V/cm }}
{{EndSpecs}}
 
==Internals==
 
The input is switched via a frequency-compensated attenuator network which is controlled by the Volts/cm switch.
 
Later Type H models use a [[Turret attenuators|turret attenuator]].
Type H with S/N less than 10,000 have ordinary rotary switches.
 
Input is then coupled to the paraphase amplifier or phase inverter made up of two [[12AU6]] pentode tubes, V3854 and V4854.
This stage converts the input signal to a differential push-pull output. Output of this stage is then passed to the first cathode follower, made  with a [[12AT7]] dual triode, V3863A and V3863B. The output from this cathode follower is then passed to the main amplifier made with a pair of [[12AU6]] pentodes, V3874 and V4874. The final output to the scope chassis is driven via final cathode follower with a [[12AT7]] dual triode tube, V3893A and V3893B, which drives pin 1 and 3 of the connector to drive the vertical amplifier inside the chassis.
 
The tubes are heated from the +75 V<sub>DC</sub> heater supply available at pin 15 of the plug-in connector. This is to avoid any  interference/hum from the regular AC heater supply at 60 Hz.
 
The chassis is shock-mounted to reduce microphonics.
 
==Pictures==


<gallery>
<gallery>
Image:Type_h_face.jpg
Type_h_face.jpg
Image:Type_h_front.jpg
Type_h_front.jpg
Image:Type_h_rear.jpg
Type_h_rear.jpg
Type_H-Top.jpg | Type H Top
Type-H-Botttom.jpg | Type H Bottom
Type-H-Side.jpg | Type H Side
Tek h schem early.png|Early schematic
Tek h schem late.png|Late schematic
Tek h turret schem.png|Turret attenuator schematic
Tek type h bnc.jpg|Late model Type H with BNC inputs
Type_H-Grey.jpg | Type H Grey Knob
Type_H-Turret.jpg | Type H with [[Turret attenuators|turret attenuator]]
</gallery>
</gallery>
==Components==
{{Parts|H}}
[[Category:500 series plugins]]

Latest revision as of 11:03, 1 July 2024

Tektronix Type H
15 MHz amplifier plug-in
Tek Type H

Compatible with 500-series scopes

Produced from 1958 to 1971

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type H is a single-channel, 15 MHz plug-in for 500-series scopes. It provides two inputs and has a switch to select between them.

A design compromise, Type H is not as fast as Type B, but it is DC-coupled on all ranges.

Type 53/54H was introduced in 1958, along with the 533 and 543, renamed Type H in 1959, and dropped after 1970.

The turret attenuator was designed by Lang Hedrick's group.

Key Specifications

Bandwidth DC to 15 MHz
Rise time 20 ns
Deflection 5 mV/cm to 20 V/cm

Internals

The input is switched via a frequency-compensated attenuator network which is controlled by the Volts/cm switch.

Later Type H models use a turret attenuator. Type H with S/N less than 10,000 have ordinary rotary switches.

Input is then coupled to the paraphase amplifier or phase inverter made up of two 12AU6 pentode tubes, V3854 and V4854. This stage converts the input signal to a differential push-pull output. Output of this stage is then passed to the first cathode follower, made with a 12AT7 dual triode, V3863A and V3863B. The output from this cathode follower is then passed to the main amplifier made with a pair of 12AU6 pentodes, V3874 and V4874. The final output to the scope chassis is driven via final cathode follower with a 12AT7 dual triode tube, V3893A and V3893B, which drives pin 1 and 3 of the connector to drive the vertical amplifier inside the chassis.

The tubes are heated from the +75 VDC heater supply available at pin 15 of the plug-in connector. This is to avoid any interference/hum from the regular AC heater supply at 60 Hz.

The chassis is shock-mounted to reduce microphonics.

Pictures

  • Type H Top

    Type H Top

  • Type H Bottom

    Type H Bottom

  • Type H Side

    Type H Side

  • Early schematic

    Early schematic

  • Late schematic

    Late schematic

  • Turret attenuator schematic

    Turret attenuator schematic

  • Late model Type H with BNC inputs

    Late model Type H with BNC inputs

  • Type H Grey Knob

    Type H Grey Knob

  • Type H with turret attenuator

    Type H with turret attenuator

Components

Some Parts Used in the H

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
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