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The '''Tektronix 513''' is a single-channel monolithic oscilloscope with 18 MHz bandwidth.  
The '''Tektronix 513''' is a single-channel monolithic oscilloscope with 18 MHz bandwidth.  
==History==
It was announced in 1949 and [[introduced in 1950]].   
It was announced in 1949 and [[introduced in 1950]].   
The initial announcement in 1949 (link below) listed the 513 at $1695,
weighing 60 pounds, with a low frequency cutoff of 5 Hz. 
As delivered to customers in 1950,
the 513 weighed an extra 15 pounds,
but had flat response down to DC and cost a bit less:
$1650 with the delay line or $1600 without.


==CRT==
It used a [[5XP]] CRT initially, and then switched to a Tek-made CRT.
It used a [[5XP]] CRT initially, and then switched to a Tek-made CRT.
It was the first Tektronix oscilloscope to contain a [[distributed amplifier]].
 
It was also the first Tek scope to contain a [[delay line]] for the vertical signal,
[[Stan Griffiths]] says,
<blockquote>
"The 513D used two different CRT types, depending on instrument serial
number. From serial number 101-1887, the 5XP2 was used (Tek Part Number
154-066). From serial number 1888-up, the [[T51P2]] was used (Tek pn 154-081).
This one was made by Tek and you could retrofit it into the early 513Ds that
came with the Dumont 5XP but it required a modification kit (040-0094-00).
I have the instructions if you need them. Later, the 154-081 (also known as
[[154-0081-00]]) was replaced by the 154-0342-00 which is quite common and also
used in the 530 series of scopes. If your 513D serial number is below 1888,
the mod kit will have to be installed if you want to use this tube. I did
not look at the mod instructions in detail, but often, with the
instructions, you can put your own kit together and modify the scope just
fine."
</blockquote>
 
==Vertical Signal Path==
The 513 has a vertical deflection sensitivity switch with seven positions. 
Each position selects a range of sensitivities.
The positions of the vertical sensitivity switch are:
{| class="wikitable
|-
! scope="col"| Position
! scope="col"| Bandwidth
! scope="col"| Comments
|-
| 0.03 to 0.1 V/div
| 2Hz to 16MHz
| Preamplifier inserted in signal path.
|-
| 0.1 to 0.3 V/div
| 2Hz to 16MHz
| Preamplifier inserted in signal path.
|-
| 0.3 to 1 V/div
| DC to 18MHz
|-
| 1 to 3 V/div
| DC to 18MHz
|-
| 3 to 10 V/div
| DC to 18MHz
|-
| 10 to 30 V/div
| DC to 18MHz
|-
| 30 to 100 V/div
| DC to 18MHz
|}
The exact sensitivity is determined by the position of the vertical amplifier attenuation control,
which is a potentiometer.
 
The preamplifier for the two most sensitive ranges is made of two [[12AW6]] pentodes
in common-cathode configuration, cascaded, followed by a cathode-follower stage
using a [[12AT7]].
 
The 513 was the first Tektronix oscilloscope to offer
a [[delay line]] for the vertical signal,
to allow viewing the leading edge of the event that triggers the sweep.
to allow viewing the leading edge of the event that triggers the sweep.
When purchased with the delay line, the 513 is a 513D.
The 513 may have been the first Tektronix oscilloscope to contain a [[distributed amplifier]]. 
It was released at about the same time as the [[514]],  
It was released at about the same time as the [[514]],  
which contains a much simpler, lower bandwidth distributed amplifier.
which contains a much simpler, lower bandwidth distributed amplifier.
The 513's distributed vertical output amplifier is seven differential stages of [[6CB6]] tubes.
The next scopes to use distributed amplifiers were  
The next scopes to use distributed amplifiers were  
the [[517]] in 1951 and then the [[541]] and [[545]] in 1955.
the [[517]] in 1951 and then the [[541]] and [[545]] in 1955.


The initial announcement in 1949 (link below) listed the 513 at $1695, weighing 60 pounds, with a low frequency cutoff of 5 Hz.  As delivered to customers in 1950,
The input impedance is 1 MΩ in parallel with 40 pF.
the 513 weighed an extra 15 pounds, but had flat response down to DC and cost a bit less: $1650 with the delay line or $1600 without.


The input impedance is 1 MΩ in parallel with 40 pF. 
The scope provides power to an optional cathode-follower probe.   
The scope provides power to an optional cathode-follower probe.   
The 513D has a delay line; the 513 does not.   
The 513D has a delay line; the 513 does not.   


The 513 and 513D contain a distributed vertical output amplifier
==Low Voltage Power Supply==
made of [[6CB6]] tubes.  The 513 has no [[thermal cutoff]] and  
 
The 513 has no [[thermal cutoff]] and  
uses [[selenium rectifiers]].
uses [[selenium rectifiers]].
==High Voltage Power Supply==
The high voltages for the 513 CRT are generated by the Tektronix Type 210B High Voltage Power Supply,


The total CRT acceleration voltage of the 513 is 12kV.
The total CRT acceleration voltage of the 513 is 12kV.
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one for the cathode voltage and three for the anode voltage.
one for the cathode voltage and three for the anode voltage.


[[Stan Griffiths]] says,
==Mechanical==
 
<blockquote>
"The 513D used two different CRT types, depending on instrument serial
number. From serial number 101-1887, the 5XP2 was used (Tek Part Number
154-066). From serial number 1888-up, the [[T51P2]] was used (Tek pn 154-081).
This one was made by Tek and you could retrofit it into the early 513Ds that
came with the Dumont 5XP but it required a modification kit (040-0094-00).
I have the instructions if you need them. Later, the 154-081 (also known as
[[154-0081-00]]) was replaced by the 154-0342-00 which is quite common and also
used in the 530 series of scopes. If your 513D serial number is below 1888,
the mod kit will have to be installed if you want to use this tube. I did
not look at the mod instructions in detail, but often, with the
instructions, you can put your own kit together and modify the scope just
fine."
</blockquote>
 
The 513 weighs 75 pounds and uses a maximum of 580 watts.
The 513 weighs 75 pounds and uses a maximum of 580 watts.


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