475: Difference between revisions

Latest revision as of 03:48, 19 June 2024

Tektronix 475

Portable 200 MHz dual-trace scope

Produced from 1972 to 1983

Manuals

475

Tektronix 475 Operators Manual (OCR, 14MB, good quality)
Tektronix 475 Service Manual (OCR)
Tektronix 475 Service Manual Corrections and Changes
Tektronix 475 with Option SN B250,000-up (165MB)
Tektronix 475/DM44 Operators Manual (16MB)

Tektronix 475 Service Manual (65MB, OK quality)
Tektronix 475 Service Manual (108MB, good quality)

475A

Tektronix 475A-DM44 Oscilloscope Instruction Manual (OCR)
Tektronix 475A Service Manual (11MB)
Tektronix 475A Schematics (needs re-OCR)
Tektronix 475A Schematics

Modifications

History

(All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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 Tekscope Vol. 4 No. 5, 1972:

Electrical design team [...] for the 475 under the leadership of Jim Hinze was: Jim Godwin, Les Larson, Steve Tosh, and Jim Woo.

Key Specifications

Bandwidth	200 MHz (475), AC cutoff 10 Hz, switchable BW limit 20 MHz, SN B100000+ also 100 MHz
Rise time	1.75 ns (475)
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
Time base	10 ns/Div to 500 ms/Div, 1−2−5, and ×10 magnifier
Input impedance	1 MΩ // 20 pF
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
X bandwidth	3 MHz
Z axis input	5 V_p-p, 50 MHz
Calibrator	1 kHz, 30 mA / 300 mV square wave
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; Probe power jack
CRT	8 × 10 cm², P31 phosphor (P11 opt.), 154-0677-00
Power	110, 115, 120, 220, 230 or 240 V_AC ±10%, 48-440 Hz, max. 100 W

Links

Lazy Electrons Tektronix 475A & DM44 Repair Page
Tek 475 / Tek 475A with DM44 @ amplifier.cd

Documents Referencing 475

Document	Class	Title	Authors	Year	Links
Tekscope 1972 V4 N5 Sep 1972.pdf	Article	The New Look in Portables		1972	465 • 475
Tekscope 1974 V6 N5.pdf	Article	Understanding oscilloscope trigger controls		1974	475 • 7B70

Patents that may apply to 475

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3562464A	Cam actuated switch having movable and fixed contacts on circuit board	Howard Vollum • Willem H Verhoef • Tony Sprando	1968-10-07	1971-02-09	Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504
Patent US 3725724A	Deflection factor indicating apparatus	Howard Vollum	1971-01-11	1973-04-03	464 • 465 • 475 • 5A14N • 5A26N • 5A48
Patent US 3719788A	Switch having ganged contacts mounted on opposite sides of circuit board	Ken Holland • Tony Sprando	1971-02-04	1973-03-06	465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7D15 • PG506
Patent US 3753170A	Step attenuator apparatus having attenuator stages selectively connected in cascade by cam actuated switches	Ken Holland	1971-02-10	1973-08-14	465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26
Patent US 3900711A	Electrical contactor assembly for high frequency applications	Ken Holland	1974-02-04	1975-08-19	465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7D15 • AM503

Videos

Zenwizard Studios

VintageTek Museum

Tek 475A / DM44 repair

Miscellaneous

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

Year	1973	1976	1980	1980 (A)	1982 (A)	1983
Catalog Price	$2,500	$2,900	$3,650	$4,050	$4,410
In 2023 Dollars	$17,300	$15,700	$13,600	$15,100	$14,100

Common Problems

See 475/Repairs

Pictures

475

Tek 475 in mixed sweep ("MIX") horizontal mode
475
475 rear
475
475 (OS-261 C) rear, with DC-Input
475/DM44 measuring a 1 kHz sine wave
475/DM44 measuring a 10 kHz sine wave
475/DM44 measuring a 100 kHz sine wave

475A

Tektronix 475A
Tektronix 475A
475A with DM44
475A with DM44
475A Time/Frequency Measurement with DM44, HP Frequency Counter used for Verifying DM44 Output.
475A rear
475A A9 Interface board
475A A6 & Fan Motor
475A A7 Timing board
475A Power Supply Section of A9
475A with DM44 Board on top
475A A3 Vertical Preamp board

475M

Components

Some Parts Used in the 475

Part	Part Number(s)	Class	Description	Used in
120-0799-01	120-0799-01	Discrete component	power transformer	475
151-0261-00	151-0261-00	Discrete component	dual PNP transistor	AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD
154-0677-xx	154-0677-00 • 154-0677-10 • 154-0677-14	CRT	CRT	475 • 475A
155-0032-00	155-0032-00 • 155-0032-01	Monolithic integrated circuit	variable-gain transconductance amplifier (voltage in, current out)	335 • 464 • 465 • 465B • 466 • 475 • 475A • 475M • 634 • 650 • 651 • 652 • 653 • 655 • 656 • 670 • 671 • 7A12 • 475 • FG504 • 1440 • 1460 • 1480 • 1481 • 1482 • 1485
155-0049-00	155-0049-00 • 155-0049-01 • 155-0049-02	Monolithic integrated circuit	sweep control with lockout	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00
155-0078-00	155-0078-xx • 155-0273-00 • 155-0274-00	Monolithic integrated circuit	broadband amplifier	464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
155-0082-00	155-0082-00	Monolithic integrated circuit	vertical output amplifier	475 • 475A
155-0085-00	155-0085-00 • 155-0085-01	Hybrid integrated circuit	input amplifier	475 • 475A • 475M
155-0091-00	155-0091-00	Monolithic integrated circuit	channel switch / HF amplifier	475 • 475A • 475M
155-0217-00	155-0216-00 • 155-0217-00	Monolithic integrated circuit	variable-gain transconductance amplifier	335 • 475 • 7D20 • FG504
SKA6516	151-0367-00	Discrete component	NPN Transistor	465 • 465B • 466 • 475
SMTD995	152-0140-01	Discrete component	10 mA, 8 pF tunnel diode	1S1 • 1S2 • 1502 • 21A • 22A • 3T5 • 3T6 • 475 • 475A • 475M • 544 • R544 • 546 • RM546 • 547 • RM547 • 556 • R556 • 581A • 585A • RM585 • 7B52 • 7B53N • 7B70 • 7B71 • 7D10 • 7D11 • 7T11 • 7T11A • R7912 • S-51 • S-52 • TU-5 • 067-0572-00 • 067-0572-01 • 067-0681-00
STD927	152-0386-00	Discrete component	10 mA, 25 pF tunnel diode	475 • 7B50 • 7B51

Some Parts Used in the 475A

Part	Part Number(s)	Class	Description	Used in
154-0677-xx	154-0677-00 • 154-0677-10 • 154-0677-14	CRT	CRT	475 • 475A
155-0032-00	155-0032-00 • 155-0032-01	Monolithic integrated circuit	variable-gain transconductance amplifier (voltage in, current out)	335 • 464 • 465 • 465B • 466 • 475 • 475A • 475M • 634 • 650 • 651 • 652 • 653 • 655 • 656 • 670 • 671 • 7A12 • 475 • FG504 • 1440 • 1460 • 1480 • 1481 • 1482 • 1485
155-0049-00	155-0049-00 • 155-0049-01 • 155-0049-02	Monolithic integrated circuit	sweep control with lockout	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00
155-0078-00	155-0078-xx • 155-0273-00 • 155-0274-00	Monolithic integrated circuit	broadband amplifier	464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
155-0082-00	155-0082-00	Monolithic integrated circuit	vertical output amplifier	475 • 475A
155-0085-00	155-0085-00 • 155-0085-01	Hybrid integrated circuit	input amplifier	475 • 475A • 475M
155-0091-00	155-0091-00	Monolithic integrated circuit	channel switch / HF amplifier	475 • 475A • 475M
155-0168-00	155-0168-00	Hybrid integrated circuit	amplifier	475A
SMTD995	152-0140-01	Discrete component	10 mA, 8 pF tunnel diode	1S1 • 1S2 • 1502 • 21A • 22A • 3T5 • 3T6 • 475 • 475A • 475M • 544 • R544 • 546 • RM546 • 547 • RM547 • 556 • R556 • 581A • 585A • RM585 • 7B52 • 7B53N • 7B70 • 7B71 • 7D10 • 7D11 • 7T11 • 7T11A • R7912 • S-51 • S-52 • TU-5 • 067-0572-00 • 067-0572-01 • 067-0681-00

Some Parts Used in the 475M

Part	Part Number(s)	Class	Description	Used in
155-0032-00	155-0032-00 • 155-0032-01	Monolithic integrated circuit	variable-gain transconductance amplifier (voltage in, current out)	335 • 464 • 465 • 465B • 466 • 475 • 475A • 475M • 634 • 650 • 651 • 652 • 653 • 655 • 656 • 670 • 671 • 7A12 • 475 • FG504 • 1440 • 1460 • 1480 • 1481 • 1482 • 1485
155-0049-00	155-0049-00 • 155-0049-01 • 155-0049-02	Monolithic integrated circuit	sweep control with lockout	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00
155-0078-00	155-0078-xx • 155-0273-00 • 155-0274-00	Monolithic integrated circuit	broadband amplifier	464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
155-0085-00	155-0085-00 • 155-0085-01	Hybrid integrated circuit	input amplifier	475 • 475A • 475M
155-0091-00	155-0091-00	Monolithic integrated circuit	channel switch / HF amplifier	475 • 475A • 475M
SMTD995	152-0140-01	Discrete component	10 mA, 8 pF tunnel diode	1S1 • 1S2 • 1502 • 21A • 22A • 3T5 • 3T6 • 475 • 475A • 475M • 544 • R544 • 546 • RM546 • 547 • RM547 • 556 • R556 • 581A • 585A • RM585 • 7B52 • 7B53N • 7B70 • 7B71 • 7D10 • 7D11 • 7T11 • 7T11A • R7912 • S-51 • S-52 • TU-5 • 067-0572-00 • 067-0572-01 • 067-0681-00

@@ Line 12: / Line 12: @@
 '''475'''
 * [[Media:070-1333-00.pdf|Tektronix 475 Operators Manual]] (OCR, 14MB, good quality)
-* [[Media:070-1332-00.pdf|Tektronix 475 Service Manual]] (65MB, OK quality, needs re-OCR)
+* [[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)
@@ Line 30: / Line 31: @@
 '''Modifications'''
 * [[Media:050-1558-00.pdf|Modification: U3165 Replacement]]
-* [[Media:062-2784-00.pdf|067-0676-00 Vertical Insertion Unit for 475 Datasheet]] (needs OCR)
+* [[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]] (needs re-OCR)
+* [[Media:tek_475a_msr.pdf|Tektronix 475A Marketing Sales Release]]
 }}
@@ Line 41: / Line 43: @@
 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 (12/24V input) on board.
+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.
@@ Line 48: / Line 52: @@
 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 }}
+{{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 | Rise time | 1.75 ns (475) }}
-{{Spec | Deflection | 2 mV/Div to 5 V/Div, 1-2-5 }}
+{{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 | Cascaded mode | 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 | 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 }}
@@ Line 62: / Line 70: @@
 {{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 }}
+{{Spec | Power | 110, 115, 120, 220, 230 or 240 V<sub>AC</sub> ±10%, 48-440 Hz, max. 100 W }}
 {{EndSpecs}}
+==Links==
+* [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}}
+{{PatentLinks|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==
@@ Line 70: / Line 101: @@
 [[155-0082-00]] vertical output amplifier, and [[155-0049-00]] sweep control.
-==Links==
+==Prices==
-* [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]
+{| class="wikitable"
-* The New Look in Portables, in [[Media:Tekscope 1972 V4 N5 Sep 1972.pdf|Tekscope Vol. 4 No. 5, 1972]]
+|-
-* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475.htm Tek 475] / [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475A_DM44.htm Tek 475A] @ amplifier.cd
+! Year
-* [https://www.youtube.com/watch?v=WPgkVThknYo Tek 475A / DM44 repair] by vintageTek Museum @ YouTube
+! 1973
-* [https://www.youtube.com/watch?v=2SESaF7Ibbw Tek 475A in operation] @ YouTube
+! 1976
-* [[050-0674-00|Handle Replacement Modification Kit]]
+! 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==
@@ Line 82: / Line 133: @@
 ==Pictures==
+===475===
 <gallery>
-A_1.JPG | Tektronix 475A
+Tek 475 mix mode.jpg        | Tek 475 in mixed sweep ("MIX") horizontal mode
-Tek 475a front.jpg | Tektronix 475A
+Tek 475 square sin.jpg      | 475
-Tek 475 mix mode.jpg|Tek 475 in mixed sweep ("MIX") horizontal mode
+Tek 475 rear.jpg            | 475 rear
-Tek 475a dm44 trace.jpg|475A with [[DM44]]
+Tek 475 dual sine.jpg       | 475
-Tek 475 square sin.jpg|475
+Tek_OS_261_rear.jpg         | 475 (OS-261 C) rear, with DC-Input
-Tek 475 rear.jpg|475 rear
+Tek475DM44 1khz.jpg         | 475/DM44 measuring a 1 kHz sine wave
-Tek 475a trace dm44.jpg|475A with [[DM44]]
+Tek475DM44 10khz.jpg        | 475/DM44 measuring a 10 kHz sine wave
-Tek 475 dual sine.jpg|475
+Tek475DM44 100khz.jpg       | 475/DM44 measuring a 100 kHz sine wave
-Tek_475A_Time-Freq.jpg | 475A Time/Frequency Measurement with [[DM44]], HP Frequency Counter used for Verifying [[DM44]] Output.
+</gallery>
-Tek 475a rear.jpg|475A rear
-Tek_OS_261_rear.jpg | 475 (OS-261 C) rear, with DC-Input
+===475A===
+<gallery>
+A_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
 A_A9-Interface_board.jpg | 475A A9 Interface board
-A_A6_Fan_motor.jpg |475A A6 & Fan Motor
+A_A6_Fan_motor.jpg       | 475A A6 & Fan Motor
-Tek_475A_A7Board.jpeg |475A A7 Timing board
+Tek_475A_A7Board.jpeg       | 475A A7 Timing board
-A_A9-PowerSupply.jpg | 475A Power Supply Section of A9
+A_A9-PowerSupply.jpg     | 475A Power Supply Section of A9
-A_DMM44_Board.jpg | 475A with [[DM44]] Board on top
+A_DMM44_Board.jpg        | 475A with [[DM44]] Board on top
 A_A3-Vertical_Preamp.jpg | 475A A3 Vertical Preamp board
-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>
 ===475M===
 <gallery>
@@ Line 115: / Line 173: @@
 </gallery>
-{{Custom ICs|475}}
+==Components==
-{{Custom ICs|475A}}
+{{Parts|475}}
+{{Parts|475A}}
+{{Parts|475M}}
 [[Category:400 series scopes]]