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The Tektronix 549 is the only [[CRT_storage_scope|storage scope]] | {{Oscilloscope Sidebar | | ||
title=Tektronix 549 | | |||
summary=30 MHz storage scope | | |||
image=Tek 549 front fl.jpg | | |||
caption=Tektronix 549 front | | |||
introduced=1966 | | |||
discontinued=1972 | | |||
manuals= | |||
* [http://bama.edebris.com/manuals/tek/549 549 manual on BAMA] | |||
* [http://w140.com/tek_549_1968_catalog.pdf Tektronix 549 in 1968 Catalog (PDF)] | |||
}} | |||
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] | |||
that takes a [[Letter-series_and_1-series_plug-ins|letter-series | that takes a [[Letter-series_and_1-series_plug-ins|letter-series | ||
or 1-series vertical plug-in]]. | or 1-series vertical plug-in]]. | ||
It was [[introduced in 1966]] and discontinued in 1972. | It was [[introduced in 1966]] and discontinued in 1972. | ||
The vertical - | The vertical -3 dB bandwidth is 30 MHz. | ||
== Mix of Transistors | ==Internals== | ||
Like many Tek scopes from the period, | === Mix of Transistors and Tubes === | ||
Like many Tek scopes from the period, the 549 uses a mix of transistors and tubes. | |||
For example, consider the buffer amplifier in the 549, | For example, consider the buffer amplifier in the 549, whose purpose is to interface | ||
whose purpose is to interface the high-impedance output | the high-impedance output of the plug-in with the low-impedance of the 200 ns delay | ||
of the plug-in with the low-impedance | line in the 549. As is usual in oscilloscope vertical circuits, the requirement is | ||
of the | to have flat frequency response from DC to the maximum frequency of the scope and | ||
As is usual in oscilloscope vertical circuits, | |||
the requirement is to have flat frequency response | |||
from DC to the maximum frequency of the scope and | |||
to have linear phase response over this same frequency range. | to have linear phase response over this same frequency range. | ||
In the 549, this buffer is implemented as follows: | |||
A [[6DJ8]] tube configured as a cathode follower | In the 549, this buffer is implemented as follows: A [[6DJ8]] tube configured as a | ||
is used at the interface with the plug-in | cathode follower is used at the interface with the plug-in to present a high impedance | ||
to present a high impedance to the plug-in. | to the plug-in. This input stage drives an NPN BJT differential amplifier, | ||
This input stage drives an NPN BJT differential amplifier, | which operates at the bottom of a cascode configuration with a [[7119]] tube on top. | ||
which operates at the bottom of a cascode configuration | The output of the cascode (the plate of the 7119) drives the [[delay line]]. | ||
with a [[7119]] tube on top. | |||
The output of the cascode (the plate of the 7119) | |||
drives the [[delay line]]. | |||
Since the entire signal path is differential, | Since the entire signal path is differential, | ||
the common-mode voltage does not have to be zero, and it is not; | the common-mode voltage does not have to be zero, and it is not; | ||
Line 30: | Line 37: | ||
After the delay line, the signal enters another cascoded differential amplifier with | After the delay line, the signal enters another cascoded differential amplifier with | ||
NPN BJTs on the bottom and [[8608]] tubes on the top. | NPN BJTs on the bottom and [[8608]] tubes on the top. | ||
== Non-Distributed Amplifier == | The vertical deflection plates of the CRT are driven by the plates of an [[8608]] | ||
The 549 is slightly unusual among 54x-series scopes | 10-watt power pentode through inductive matching/peaking networks. | ||
in that it does not use a | |||
[[distributed amplifier|distributed vertical amplifier]]. | ===Non-Distributed Amplifier=== | ||
The 549 is slightly unusual among 54x-series scopes in that it does not | |||
use a [[distributed amplifier|distributed vertical amplifier]]. | |||
(Other exceptions include the [[545|545B]] and [[547]]). | (Other exceptions include the [[545|545B]] and [[547]]). | ||
== Triggering == | ===Triggering=== | ||
Triggering is done using an NPN BJT Schmitt trigger. | Triggering is done using an NPN BJT Schmitt trigger. | ||
== Storage == | ===Storage=== | ||
The screen has two storage targets, upper and lower, whose storage mode and erase signals can be controlled independently. | The screen has two storage targets, upper and lower, whose storage mode and erase signals can be controlled independently. There is a remote control cable/switch, part number 012-0102-00, that can erase the screen and reset the single sweep. | ||
There is a remote control cable/switch, part number 012-0102-00, that can erase the screen and reset the single sweep. | |||
==Specifications== | |||
The 549 weighs 68 pounds and consumes 600 watts. | The 549 weighs 68 pounds and consumes 600 watts. | ||
[[Category:Specifications needed]] ''please add'' | |||
==Pictures== | |||
<gallery> | <gallery> | ||
File:Tek 549 front fl.jpg | |||
File:549_front.jpg|Front of a 549. | |||
File:549_vert_amp.jpg|Vertical amp. | |||
File:549_top.jpg|Top view. | |||
File:549_storage_board.jpg|Storage board. | |||
File:549_inside_door.jpg|Power supply behind door. | |||
File:Wellenkino_549-8.jpg | File:Wellenkino_549-8.jpg | ||
File:Wellenkino 549-7.jpg | File:Wellenkino 549-7.jpg |