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{{Oscilloscope Sidebar |
title=Tektronix 561 |
summary=Sampling scope |
image=Tek 561s.jpg |
caption=Tektronix 561S front |
years=1961 - ? |
manuals=
* [http://bama.edebris.com/download/tek/561/561scope.pdf Tektronix 561 Manual (PDF)]
* [http://w140.com/tek_rm561.pdf Tektronix RM561 Manual (PDF)]
* [http://bama.edebris.com/download/tek/561a/561a.djvu Tektronix 561A Manual (DjVu)]
* [http://bama.edebris.com/download/tek/561b/561b.djvu Tektronix 561B Manual (DjVu)]
* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)]
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]}}
The 561 is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and
The 561 is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and
produced in various versions well into the 1970's.   
produced in various versions well into the 1970's.   
==Versions==
Over its life, the 561 was actually a series of four very different scopes,  
Over its life, the 561 was actually a series of four very different scopes,  
plus the rack mount versions of each.   
plus the rack mount versions of each.   


==561==
===561===
The original 561 and RM561 were introduced in 1961.   
The original 561 and RM561 were introduced in 1961.   
Similar to the 560, also [[introduced in 1961]], the 561 has a round CRT.   
Similar to the 560, also [[introduced in 1961]], the 561 has a round CRT.   
It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz.
It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz.
The 561 uses the T5032 CRT, which has a glass envelope.
The 561 uses the T5032 CRT, which has a glass envelope.


==561A==
===561A===
The short lived 561 was replaced by the 561A and the rackmount version RM561A in 1962.   
The short lived 561 was replaced by the 561A and the rackmount version RM561A in 1962.   
The 561A were the highest selling model in the 560 series.   
The 561A were the highest selling model in the 560 series.   
They introduced a revolutionary new CRT, the T5611, incorporating many “firsts”  
They introduced a revolutionary new CRT, the T5611, incorporating many “firsts”  
that would remain through most of Tek's analog scopes to follow – a  
that would remain through most of Tek's analog scopes to follow – a rectangular faceplate
rectangular faceplate allowing a more compact CRT,  
allowing for a more compact CRT, and a ceramic CRT envelope which provided more mechanical
and a ceramic CRT envelope which provided more mechanical precision than a blown glass tube.   
precision than a blown glass tube.  This also enabled the use of a separate face plate made
This also enabled the use of a separate face plate made from a flat glass panel that could have the graticule markings printed on the [[phosphor]] side of the faceplate. 
from a flat glass panel that could have the graticule markings printed on the [[phosphor]]  
This totally eliminated parallax errors, and allows for better edge illumination.  
side of the faceplate, totally eliminating parallax errors, and allowing for better  
edge illumination.  
 
The 561A supports all 2 and 3 series plug-ins.   
The 561A supports all 2 and 3 series plug-ins.   
The popular 60 and 70 series plug-ins were renamed  
The popular 60 and 70 series plug-ins were renamed  
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Due to the higher power consumption,  
Due to the higher power consumption,  
these newer plug-ins can not be used in the original 561.   
these newer plug-ins can not be used in the original 561.   
The highest bandwidth plug-ins gave a system bandwidth of 10 MHz.
The highest bandwidth plug-ins gave a system bandwidth of 10 MHz.


==561B==
===561B===
The 561B / RM561B were [[introduced in 1969]].   
The 561B / RM561B were [[introduced in 1969]].   
The B models actually provided no performance improvements over the 561A,  
The B models actually provided no performance improvements over the 561A,  
with the change being limited to all solid state design,  
with the change being limited to all solid state design, including the HV rectifiers.   
including the HV rectifiers.   
While this improves reliability of the mainframe,  
While this improves reliability of the mainframe,  
no all solid state plug-ins were ever designed.   
no all solid state plug-ins were ever designed.   
The 561B uses the same 2 and 3 series plug-ins used by the 561A.
The 561B uses the same 2 and 3 series plug-ins used by the 561A.


==561S==
===561S===
A special 561S was introduced as a special product,  
A special 561S was introduced as a special product, modified from a 561A.   
modified from a 561A.   
It did not appear in any Tek catalog.   
It did not appear in any Tek catalog.   
With special modified amplifier and time base ([[3A1S]] and [[3B1S]]),
With special modified amplifier and time base ([[3A1S]] and [[3B1S]]),
and a special CRT (T5033),
and a special CRT (T5033), it achieved a 25 MHz system bandwidth,  
it achieved a 25 MHz system bandwidth,  
which is 2.5 times the bandwidth of a 561A.
which is 2.5x the bandwidth of a 561A.
 
The 3A1S and 3B1S were the only plug-ins that could be used in the 561S
The 3A1S and 3B1S were the only plug-ins that could be used in the 561S
because the T5033 CRT has higher deflection sensitivity than the CRT used in
because the T5033 CRT has higher deflection sensitivity than the CRT used in
the 561, 561A, and 561B.  The vertical deflection sensitivity of the  
the 561, 561A, and 561B.  The vertical deflection sensitivity of the  
T5033 is 11.7 volts/cm. The 561A has the T561 CRT which has vertical
T5033 is 11.7 V/cm. The 561A has the T561 CRT which has vertical
deflection sensitivity of 19.5 volts/cm.  
deflection sensitivity of 19.5 V/cm.  
The higher BW of the 561S came at the expense of  
 
The higher bandwidth of the 561S came at the expense of  
trading off some of the advances gained in the original 561A.   
trading off some of the advances gained in the original 561A.   
The CRT is a conventional glass envelope,  
The CRT is a conventional glass envelope, without internal graticule.   
without internal graticule.   
Also, the scale was reduced from 8 × 10 divisions to 6 × 10.
Also, the scale was reduced from 8 x 10 divisions to 6 x 10.
The 561S has a no post-deflection acceleration, and a CRT cathode
The 561S has a no post-deflection acceleration, and a CRT cathode
voltage of -3300V, like the other 561 models.
voltage of -3300 V, like the other 561 models.
 
* [http://bama.edebris.com/download/tek/561/561scope.pdf Tektronix 561 Manual (PDF)]
* [http://w140.com/tek_rm561.pdf Tektronix RM561 Manual (PDF)]
* [http://bama.edebris.com/download/tek/561a/561a.djvu Tektronix 561A Manual (DjVu)]
* [http://bama.edebris.com/download/tek/561b/561b.djvu Tektronix 561B Manual (DjVu)]
* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)]
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]


==Specifications==
[[Category:Specifications needed]]


==Pictures==
<gallery>
<gallery>
Image:Tek 561s.jpg|Tek 561S
Image:Tek 561s.jpg|Tek 561S
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Image:RM561A.JPG|Tek RM561A w 3A74 and 2B67
Image:RM561A.JPG|Tek RM561A w 3A74 and 2B67
</gallery>
</gallery>
[[Category:560 series scopes]]
[[Category:Sampling scopes]]
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