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The Tektronix 515 is a 15MHz single-trace all-tube oscilloscope.  It does not use plug-ins.
{{Oscilloscope Sidebar |
A rackmount version, the RM15 was also sold.
title=Tektronix 515|
summary=15 MHz Tube scope |
image=515a trace.jpg |
caption=Tektronix 515 front |
introduced=1955 |
discontinued=(?) |
manuals=
* [http://w140.com/mmm/tek-515.pdf Tektronix 515 Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_515a_factory_cal_proc.pdf Tektronix 515A Factory Calibration Procedure, May 1960 (PDF)]
* [[Media:tek_515a_fcp.pdf|Tektronix 515A Factory Calibration Procedure, May 1960 (PDF, OCR)]]
* [[Media:Tek 515a fcp dec 1968.pdf | Tektronix 515A Factory Calibration Procedure, December 1968 (PDF, needs OCR)]]
* [[Media:Tek 515a mod 760a.pdf|Tektronix 515A Mod 760A]]
 
}}
The '''Tektronix 515''' is a 15 MHz single-trace all-tube oscilloscope [[introduced in 1955]].   
It does not use plug-ins.
 
A rack-mount version, the RM15 was also sold.
There is also a 515A (serial numbers 101 through 1000 are "Type 515", 1001 and upward are "Type 515A"). 
 
The 515A has a Z-axis input and slightly higher vertical sensitivity than the 515.
Maximum vertical sensitivity is 100 mV/Div for the 515 and 50 mV/Div for the 515A.
The [[516]] is essentially a dual-trace version of the 515.
 
The 515 and 515A are fan-cooled, both in benchtop and rackmount forms.
 
{{BeginSpecs}}
{{Spec | Channels  | One vertical channel (two input connectors and a switch to select) }}
{{Spec | Bandwidth  | DC to 15 MHz }}
{{Spec | Rise time  | 23 ns }}
{{Spec | Deflection | 50 mV/div to 20 V/div (515A), 100 mV/div to 50 V/div (515) }}
{{Spec | Sweep      | 0.2 μs/div to 2 s/div }}
{{Spec | CRT        | [[T55|T55 CRT CRT]], P31 [[phosphor]] standard, 6 cm linear vertical deflection }}
{{Spec | Input impedance | 1 MΩ // 30 pF }}
{{Spec | Power consumption | 275 W }}
{{Spec | Weight    | 40 pounds (18 kg) }}
{{EndSpecs}}
 
==Links==
* [http://www.museum-nt.de/objekte/tek_515a.html Tek 515A] @ museum-nt.de
* [https://www.youtube.com/watch?v=5OeEwtCBuYI Tektronix 515A checkout] @ youtube.com
 
==Internals==
The HV power supply uses three [[5642]] rectifiers to produce +2325 V for the CRT anode
and -1675 V for the CRT cathode.  The LV power supply is linear, using a [[6080]] tube as
the pass tube of the series regulator for +300 V and +100 V supply.  The -150 V supply is
regulated by a [[6AU5]] tube.  The voltage reference for the -150 V supply is a [[5651]]
tube.  The 515 and 515A use [[selenium rectifiers]].  A kit was later made available
for converting them to silicon rectifiers for improved reliability. 
Starting at serial number 4424, the 515A used the [[120-142]] power transformer,
the same part that is used in the [[516]].
 
The vertical amplifier is fully differential, DC-coupled, and all tube.  The stages are as follows:
 
* input buffer, cathode followers, [[6AU6]]
* first gain stage, differential amplifier, T-coil, [[12BY7]]
* unity gain buffer, cathode follower, [[6DJ8]]
* output amplifier, differential amplifier, T-coil, [[6CL6]]
 
The horizontal amplifier uses half of a [[6DJ8]] as a buffer, followed by a 6DJ8 as a
differential amplifier and phase splitter, followed by the two halves of another [[6DJ8]]
as the output cathode followers driving the horizontal CRT deflection plates.
 
The trigger is a 6DJ8 differential trigger amplifier followed by a 6DJ8 Schmitt trigger.
 
==Pictures==


<gallery>
<gallery>
Image:rm15_1.jpg|RM15 front view
rm15_1.jpg|RM15 front view
Image:rm15_2.jpg|RM15 side view
rm15_2.jpg|RM15 side view
Image:rm15_3.jpg|RM15 top view
Tek 515 vertical path.png|Vertical signal path
Image:rm15_4.jpg|RM15 bottom view
rm15_3.jpg|RM15 top view
rm15_4.jpg|RM15 bottom view
Tek 515a 1.jpg|515A
Tek 515a 2.jpg|515A
Wellenkino 515a.jpg|515A
Tek 515a right.jpg|515A Left internal view
Tek 515a hvps 4.jpg|515A CRT circuit
Tek 515a hvps 3.jpg|515A HV power supply
Tek 515a hvps 2.jpg|515A HV power supply
Tek 515a hvps 1.jpg|515A HV power supply
Tek-rm15 DxO.jpg
Tek 515a trace2.jpg|515A
Tek 515a left internal.jpg|515A left internal
Tek 515a right internal.jpg|515A right internal
Tek 515a s1 1.jpg|515A S1
Tek 515a s1 2.jpg|515A S1
Tek 515a s1 3.jpg|515A S1
Tek 515a s1 4.jpg|515A S1
Tek 515a s1 5.jpg|515A S1
Tek rm15 inside.jpg|RM15
Tek rm15 inside2.jpg|RM15
Tek rm15 left controls.jpg|RM15
Tek rm15 right controls.jpg|RM15
Tek rm15 rear.jpg|RM15 rear
Tek 515a cal trace.jpg|515A
Tek 515a 34.jpg|515A
Blue tek 515a.jpg|Blue 515A
</gallery>
</gallery>
[[Category:Monolithic tube scopes]]

Revision as of 11:10, 22 June 2020

Manuals – Specifications – Links – Pictures

The Tektronix 515 is a 15 MHz single-trace all-tube oscilloscope introduced in 1955. It does not use plug-ins.

A rack-mount version, the RM15 was also sold. There is also a 515A (serial numbers 101 through 1000 are "Type 515", 1001 and upward are "Type 515A").

The 515A has a Z-axis input and slightly higher vertical sensitivity than the 515. Maximum vertical sensitivity is 100 mV/Div for the 515 and 50 mV/Div for the 515A. The 516 is essentially a dual-trace version of the 515.

The 515 and 515A are fan-cooled, both in benchtop and rackmount forms.

Key Specifications

Channels One vertical channel (two input connectors and a switch to select)
Bandwidth DC to 15 MHz
Rise time 23 ns
Deflection 50 mV/div to 20 V/div (515A), 100 mV/div to 50 V/div (515)
Sweep 0.2 μs/div to 2 s/div
CRT T55 CRT CRT, P31 phosphor standard, 6 cm linear vertical deflection
Input impedance 1 MΩ // 30 pF
Power consumption 275 W
Weight 40 pounds (18 kg)

Links

Internals

The HV power supply uses three 5642 rectifiers to produce +2325 V for the CRT anode and -1675 V for the CRT cathode. The LV power supply is linear, using a 6080 tube as the pass tube of the series regulator for +300 V and +100 V supply. The -150 V supply is regulated by a 6AU5 tube. The voltage reference for the -150 V supply is a 5651 tube. The 515 and 515A use selenium rectifiers. A kit was later made available for converting them to silicon rectifiers for improved reliability. Starting at serial number 4424, the 515A used the 120-142 power transformer, the same part that is used in the 516.

The vertical amplifier is fully differential, DC-coupled, and all tube. The stages are as follows:

  • input buffer, cathode followers, 6AU6
  • first gain stage, differential amplifier, T-coil, 12BY7
  • unity gain buffer, cathode follower, 6DJ8
  • output amplifier, differential amplifier, T-coil, 6CL6

The horizontal amplifier uses half of a 6DJ8 as a buffer, followed by a 6DJ8 as a differential amplifier and phase splitter, followed by the two halves of another 6DJ8 as the output cathode followers driving the horizontal CRT deflection plates.

The trigger is a 6DJ8 differential trigger amplifier followed by a 6DJ8 Schmitt trigger.

Pictures