7A19: Difference between revisions

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{{Plugin Sidebar|
{{Plugin Sidebar
title=Tektronix 7A19|
|manufacturer=Tektronix
summary=600 MHz amplifier|
|series=7000-series scopes
image=7a19-front.jpg |  
|type=7A19  
caption=7A19 front view|
|summary=600 MHz amplifier  
years=? |
|image=7a19-front.jpg  
type=Vertical Amplifier|
|caption=7A19 front view  
series=[[7000-series scopes]]|
|introduced=1971
manuals=
|discontinued=1991
|designers=Thor Hallen;Val Garuts
|manuals=
* [[Media:070-2129-00.pdf|Tektronix 7A19 Instruction Manual]] (OCR, PDF)
* [http://bama.edebris.com/download/tek/7a19/tek-7a19.pdf Tektronix 7A19 Manual (PDF)]
* [http://bama.edebris.com/download/tek/7a19/tek-7a19.pdf Tektronix 7A19 Manual (PDF)]
* [http://w140.com/smb/7a19_sm.pdf Tektronix 7A19 Manual (OCR, PDF)]
* [http://w140.com/smb/7a19_sm.pdf Tektronix 7A19 Manual (OCR, PDF)]
}}
}}
The '''Tektronix 7A19''' is a one-channel 600 MHz vertical amplifier plug-in for [[7000-series scopes]], designed by [[Thor Hallen]] and introduced along with the [[7904]] mainframe in late 1971/early 1972 (note 1).


The 7A19 is a one-channel vertical plug-in for [[7000-series scopes]]. 
==Operation==


An option (#4) was available that added a variable signal delay, intended to match timing between multiple channels.
The 7A19 has no variable gain control.  An option (#4) was available that added a variable signal delay (±0.5 ns implemented using a mechanically variable passive delay line), intended to match timing between multiple channels.


The 7A19 uses the [[155-0068-00]] amplifier IC.
The pre-charge setting on the input coupling switch is intended for situations where there might be residual charge on the input coupling capacitor that could overload the input.  To use it, one sets the switch to PRE-CHG before connecting the input signal, then waits two seconds before switching to AC (LF point is 1 kHz).  The PRE-CHG setting also serves as a ×100 attenuator having a 5 kΩ input impedance in series with 2 μF, extending LF cutoff down to 20 Hz. In the AC GND position, the input is disconnected from the amplifier and terminated in a capacitively coupled 50 Ω load.


==Specifications==
{{BeginSpecs}}
* Input impedance: 50 Ω
{{Spec | Input impedance | 50 Ω  }}
* Bandwidth: 600 MHz
{{Spec | Bandwidth | 600 MHz (500 MHz in [[7904]]) }}
{{Spec | Deflection | 10 mV/Div to 1 V/Div, 1−2−5. Pre-charge circuit may be used as a calibrated ×100 attenuator. }}
{{Spec | Maximum input | 2 W average or 50 Div, in AC mode 100 V DC+peak AC }}
{{Spec | Variable delay (Opt.4) | −0.5 ns to +0.5 ns}}
{{EndSpecs}}
 
==Internals==
The 50 Ω input impedance of the 7A19 is provided by a pair of 100 Ω resistors in parallel.
The resistors are protected by a pair of fuses in parallel.
The manual explains that the motivation for using two fuses in parallel is
to minimize the effect of the series impedance of the fuses.
 
The only active device in the vertical signal path of the 7A19 is an [[155-0068-00]] amplifier hybrid, (U40, Tek internal part number H101).
A second [[155-0068-00]] is used in the trigger signal path of the 7A19, which is almost identical to the vertical signal path.
 
The 7A19 uses the ±50 V supplies provided by the mainframe.
 
==Notes==
# See [[7A11]] and [[John Addis]], ''Good Engineering and Fast Vertical Amplifiers'', in Jim Williams (Ed.), ''Analog Circuit Design: Art, Science and Personalities'' (1991), p. 114, and [http://w140.com/tektronix_new_products_1972.pdf Tektronix New Products 1972] brochure.
 
==Prices==
{| class="wikitable"
|-
! Year
! 1972
! 1977
! 1980
! 1984
! 1987
! 1990
|-
! Catalog price
|align=right| $500
|align=right| $1,000
|align=right| $1,475
|align=right| $2,450
|align=right| $2,895
|align=right| $3,340
|-
! In 2021 Dollars
|align=right| $3,300
|align=right| $4,600
|align=right| $5,000
|align=right| $6,500
|align=right| $7,000
|align=right| $7,100
|-
|}
 
==Pictures==
 
==


==Pictures==
==Pictures==


<gallery>
<gallery>
File:7a19-front.jpg | 7A19 without option
7a19-front.jpg | 7A19 without option
File:Tek 7a19 front.jpg | 7A19 with Opt. 4 (Variable Delay).
Tek 7a19 front.jpg | 7A19 with Opt. 4 (Variable Delay).
</gallery>
</gallery>
===Earlier model ===
===Earlier model ===
<gallery>
<gallery>
File:7a19-early-left.jpg | Left side (early model with Weinschel attenuator)
7a19-early-left.jpg | Left side (early model with Weinschel attenuator, without Opt. 4)
File:7a19-early-right.jpg | Right side (early model with Weinschel attenuator)
7a19-early-right.jpg | Right side (early model with Weinschel attenuator)
</gallery>
</gallery>


===Later model (B030000+)===
===Later model (B030000+)===
<gallery>
<gallery>
File:Tek 7a19 left.jpg | Left side
Tek 7a19 left.jpg | Left side (Opt.4 delay line enclosure in front)
File:Tek 7a19 right.jpg | Right side
Tek 7a19 right.jpg | Right side
File:Tek 7a19 frontright.jpg | Front right, Tek-built attenuator
Tek 7a19 frontright.jpg | Front right, Tek-built attenuator
File:Tek 7a19 rearright.jpg | Rear right
Tek 7a19 rearright.jpg | Rear right
File:Tek 7a19 frontleft.jpg |Front left
Tek 7a19 frontleft.jpg |Front left
File:Tek 7a19 rearleft.jpg | Front right
Tek 7a19 rearleft.jpg | Front right
File:Tek 7a19 top.jpg | Top view
Tek 7a19 top.jpg | Top view
File:Tek 7a19 att sw1.jpg | Attenuator switch contacts
Tek 7a19 att sw1.jpg | Attenuator switch contacts
File:Tek 7a19 att sw2.jpg | Contacts detail
Tek 7a19 att 1.jpg | Attenuator element
File:Tek 7a19 att sw3.jpg | Contacts detail
Tek 7a19 att 2.jpg | Attenuator element
Tek 7a19 att sw2.jpg | Contacts detail
Tek 7a19 att sw3.jpg | Contacts detail
Tek 7a19 schematic.jpg|Late-model 7A19 schematic
</gallery>
</gallery>


{{Custom ICs|7A19}}


[[Category:7000 series vertical plugins]]
[[Category:7000 series vertical plugins]]
[[Category:Specifications needed]]

Revision as of 07:23, 4 December 2021

Tektronix 7A19
600 MHz amplifier
7A19 front view

Compatible with 7000-series scopes

Produced from 1971 to 1991

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

The Tektronix 7A19 is a one-channel 600 MHz vertical amplifier plug-in for 7000-series scopes, designed by Thor Hallen and introduced along with the 7904 mainframe in late 1971/early 1972 (note 1).

Operation

The 7A19 has no variable gain control. An option (#4) was available that added a variable signal delay (±0.5 ns implemented using a mechanically variable passive delay line), intended to match timing between multiple channels.

The pre-charge setting on the input coupling switch is intended for situations where there might be residual charge on the input coupling capacitor that could overload the input. To use it, one sets the switch to PRE-CHG before connecting the input signal, then waits two seconds before switching to AC (LF point is 1 kHz). The PRE-CHG setting also serves as a ×100 attenuator having a 5 kΩ input impedance in series with 2 μF, extending LF cutoff down to 20 Hz. In the AC GND position, the input is disconnected from the amplifier and terminated in a capacitively coupled 50 Ω load.

Key Specifications

Input impedance 50 Ω
Bandwidth 600 MHz (500 MHz in 7904)
Deflection 10 mV/Div to 1 V/Div, 1−2−5. Pre-charge circuit may be used as a calibrated ×100 attenuator.
Maximum input 2 W average or 50 Div, in AC mode 100 V DC+peak AC
Variable delay (Opt.4) −0.5 ns to +0.5 ns

Internals

The 50 Ω input impedance of the 7A19 is provided by a pair of 100 Ω resistors in parallel. The resistors are protected by a pair of fuses in parallel. The manual explains that the motivation for using two fuses in parallel is to minimize the effect of the series impedance of the fuses.

The only active device in the vertical signal path of the 7A19 is an 155-0068-00 amplifier hybrid, (U40, Tek internal part number H101). A second 155-0068-00 is used in the trigger signal path of the 7A19, which is almost identical to the vertical signal path.

The 7A19 uses the ±50 V supplies provided by the mainframe.

Notes

  1. See 7A11 and John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p. 114, and Tektronix New Products 1972 brochure.

Prices

Year 1972 1977 1980 1984 1987 1990
Catalog price $500 $1,000 $1,475 $2,450 $2,895 $3,340
In 2021 Dollars $3,300 $4,600 $5,000 $6,500 $7,000 $7,100

Pictures

==

Pictures

Earlier model

Later model (B030000+)

Custom ICs used in the 7A19

Page Model Part nos Description Designers Used in
155-0068-00 H101 155-0068-00 amplifier 7A19