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The Tektronix 475 is similar to the [[465]], but with 200MHz bandwidth.  A revised version, the 475A
{{Oscilloscope Sidebar
has 250MHz bandwidth.
|manufacturer=Tektronix
|series=400-series scopes
|model=475
|summary=Portable 200 MHz dual-trace scope
|image=Tek 475 square sin.jpg
|caption= Tektronix 475  
|introduced=1972
|discontinued=1983
|designers=Leon Orchard;Luis Navarro;Bob Shand;Jim Hinze;Jim Godwin;Les Larson;Steve Tosh;Jim Woo;Ken Holland;Bill Mark;George Ermini;Dennis Braatz
|manuals=
'''475'''
* [[Media:070-1333-00.pdf|Tektronix 475 Operators Manual]] (OCR, 14MB, good quality)
* [[Media:070-1332-00.pdf|Tektronix 475 Service Manual]] (OCR)
* [[Media:Tek 475 corrections and changes.pdf|Tektronix 475 Service Manual Corrections and Changes]]
* [[Media:070-1862-00.pdf|Tektronix 475 with Option SN B250,000-up]] (165MB)
* [[Media:070-2039-00.pdf|Tektronix 475/DM44 Operators Manual]] (16MB)


475A [[list of manuals that are needed|manual needed]]. No good quality free scan available.
* [[Media:tek_475_tek.pdf|Tektronix 475 Service Manual]] (65MB, OK quality)
* [[Media:Tektronix_475_Oscilloscope_Service_Manual.pdf|Tektronix 475 Service Manual]] (108MB, good quality)


* [http://w140.com/tek_475_tek.pdf Tektronix 475 Manual (PDF)]
* [[Media:TB-9-6625-2240-35.pdf|475 calibration (Army)]] (OCR)
* [[Media:070-1739-01.pdf|475 and DM43/DM40 Instruction Manual]]
 
'''475A'''
* [[Media:070-2163-00.pdf|Tektronix 475A-DM44 Oscilloscope Instruction Manual]] (OCR)
* [[Media:070-2162-00.pdf|Tektronix 475A Service Manual]] (11MB)
* [[Media:tek_475a_block_diagram.pdf|Tektronix 475A Schematics]] (needs re-OCR)
* [[Media:tek_475a_schematics.pdf|Tektronix 475A Schematics]]
 
'''Modifications'''
* [[Media:050-1558-00.pdf|Modification: U3165 Replacement]]
* [[Media:062-2784-00.pdf|067-0676-00 Vertical Insertion Unit for 475 Datasheet]]
* [[050-0674-00|Handle Replacement Modification Kit]]
 
'''History'''
* [[Media:Tek 465 and 475 marketing sales release.pdf|Tektronix 465 and 475 Marketing Sales Release]]
* [[Media:tek_475a_msr.pdf|Tektronix 475A Marketing Sales Release]]
 
}}
The '''Tektronix 475''' is a portable dual-trace oscilloscope with dual time-bases similar to the [[465]],
but with 200 MHz bandwidth and a maximum vertical sensitivity of 2 mV/Div.
It is all solid-state except for the CRT.  It was introduced in November 1972.
 
The military variant is called OS-261 C(v)1/0, which has a DC/DC converter (12/24 V input) on board.
 
The 475M is a standard 475 with enhanced environmental specs.
 
A revised version, the 475A ([[introduced in 1977]]), has 250 MHz bandwidth and a maximum vertical sensitivity of 5 mV/Div.
 
The [[1106]] is a battery pack for the 475.
 
The optional [[DM44]] multimeter attaches to the top of the instrument.
 
From [[Media:Tekscope 1972 V4 N5 Sep 1972.pdf|Tekscope Vol. 4 No. 5, 1972]]:
<blockquote>
Electrical design team [...] for the 475 under the leadership of [[Jim Hinze]] was: [[Jim Godwin]], [[Les Larson]], [[Steve Tosh]], and [[Jim Woo]].
</blockquote>
 
{{BeginSpecs}}
{{Spec | Bandwidth | 200 MHz (475), AC cutoff 10 Hz, switchable BW limit 20 MHz, SN B100000+ also 100 MHz }}
{{Spec | Rise time | 1.75 ns (475) }}
{{Spec | Deflection | 2 mV/Div to 5 V/Div, 1−2−5; 400 μV/Div, 50 MHz with CH1 input connected to CH2 VERT SIG OUT }}
{{Spec | Time base | 10 ns/Div to 500 ms/Div, 1−2−5, and ×10 magnifier }}
{{Spec | Input impedance | 1 MΩ // 20 pF }}
{{Spec | Triggering | 0.3 Div (int) or 50 mV (ext) to 40 MHz, increasing to 1.5 Div/250 mV at 200 MHz; AC coupling >60 Hz; LF REJ >50 kHz, HF REJ <50 kHz }}
{{Spec | X bandwidth | 3 MHz }}
{{Spec | Z axis input | 5 V<sub>p-p</sub>, 50 MHz }}
{{Spec | Calibrator | 1 kHz, 30 mA / 300 mV square wave }}
{{Spec | Outputs | CH2 Vert Signal Out, 20 mV/Div into 1 MΩ or 10 mV/Div into 50 Ω; A and B +GATE OUT, +5 V; [[LEMO S-series connector|Probe power jack]] }}
{{Spec | CRT | 8 × 10 cm², P31 phosphor (P11 opt.), [[154-0677-00]]  }}
{{Spec | Power | 110, 115, 120, 220, 230 or 240 V<sub>AC</sub> ±10%, 48-440 Hz, max. 100 W }}
{{EndSpecs}}
 
==Links==
 
===Documents and reports===
* [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475.htm      Tek 475] / [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475A_DM44.htm Tek 475A with DM44] @ amplifier.cd
{{Documents|Link=475}}
 
===Videos===
 
====Zenwizard Studios====
* [https://www.youtube.com/watch?v=gEXYRPNohyA Tektronix 475 151-0367-00 Guaranteed Bad Parts] ''caution - see notes on [[151-0367-00]] page''
* [https://www.youtube.com/watch?v=982GcYWIjWI Tektronix 475 non-A Repair and Restoration]
* [https://www.youtube.com/watch?v=KzVMbhytWOg Tektronix 475A and DM44 Power Supply and Tube Alignment]
* [https://www.youtube.com/watch?v=5fGnnTfDNPA Tektronix 475A and DM44 Horizontal Alignment]
* [https://www.youtube.com/watch?v=wfw60QmUp_A Tektronix 475A and DM44 Repair Power Supply and Logic]
* [https://www.youtube.com/watch?v=gtDnTN14JL0 Tektronix 475A Vertical Alignment and One Last Power Supply Issue]
* [https://www.youtube.com/watch?v=tw55DrUR8s8 Tektronix 475A Trigger Section Alignment]
 
====VintageTek Museum====
* [https://www.youtube.com/watch?v=WPgkVThknYo Tek 475A / DM44 repair]
 
====Miscellaneous====
* [https://www.youtube.com/watch?v=2SESaF7Ibbw Tek 475A in operation]
 
==Internals==
The 475 uses a number of Tek-made integrated circuits, including the [[155-0032-01]] input preamplifier,
[[155-0085-00]] input amplifier, [[155-0078-00]] vertical amplifier, [[155-0091-00]] channel switch,
[[155-0082-00]] vertical output amplifier, and [[155-0049-00]] sweep control.
 
==Prices==
{| class="wikitable"
|-
! Year
! 1973
! 1976
! 1980
! 1980 (A)
! 1982 (A)
! 1983
|-
! Catalog Price
|align=right| $2,500
|align=right| $2,900
|align=right| $3,650
|align=right| $4,050
|align=right| $4,410
|
|-
! In 2023 Dollars
|align=right| $17,300
|align=right| $15,700
|align=right| $13,600
|align=right| $15,100
|align=right| $14,100
|
|}
 
==Common Problems==
* See [[475/Repairs]]
 
==Pictures==
 
===475===
<gallery>
Tek 475 mix mode.jpg        | Tek 475 in mixed sweep ("MIX") horizontal mode
Tek 475 square sin.jpg      | 475
Tek 475 rear.jpg            | 475 rear
Tek 475 dual sine.jpg      | 475
Tek_OS_261_rear.jpg        | 475 (OS-261 C) rear, with DC-Input
Tek475DM44 1khz.jpg        | 475/DM44 measuring a 1 kHz sine wave
Tek475DM44 10khz.jpg        | 475/DM44 measuring a 10 kHz sine wave
Tek475DM44 100khz.jpg      | 475/DM44 measuring a 100 kHz sine wave
</gallery>
 
===475A===
<gallery>
475A_1.JPG                  | Tektronix 475A
Tek 475a front.jpg          | Tektronix 475A
Tek 475a dm44 trace.jpg    | 475A with [[DM44]]
Tek 475a trace dm44.jpg    | 475A with [[DM44]]
Tek_475A_Time-Freq.jpg      | 475A Time/Frequency Measurement with [[DM44]], HP Frequency Counter used for Verifying [[DM44]] Output.
Tek 475a rear.jpg          | 475A rear
475A_A9-Interface_board.jpg | 475A A9 Interface board
475A_A6_Fan_motor.jpg      | 475A A6 & Fan Motor
Tek_475A_A7Board.jpeg      | 475A A7 Timing board
475A_A9-PowerSupply.jpg    | 475A Power Supply Section of A9
475A_DMM44_Board.jpg        | 475A with [[DM44]] Board on top
475A_A3-Vertical_Preamp.jpg | 475A A3 Vertical Preamp board
</gallery>
 
===475M===
<gallery>
Tek 475m 1.jpg
Tek 475m 2.jpg
Tek 475m 3.jpg
Tek 475m 4.jpg
Tek 475m 5.jpg
Tek 475m 6.jpg
Tek 475m 7.jpg
</gallery>
 
==Components==
{{Parts|475}}
{{Parts|475A}}
{{Parts|475M}}
 
[[Category:400 series scopes]]
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