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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 475 |
|manufacturer=Tektronix
summary=Portable 200 MHz dual-trace scope |
|series=400-series scopes
image=Tek 475 square sin.jpg |
|model=475
caption= Tektronix 475 |
|summary=Portable 200 MHz dual-trace scope
introduced=1972 |
|image=Tek 475 square sin.jpg
discontinued=1983 |
|caption= Tektronix 475  
manuals=
|introduced=1972  
* [http://w140.com/tek_475_tek.pdf Tektronix 475 Manual (65MB file, ok quality, PDF)]
|discontinued=1983  
* [http://w140.com/Tektronix_475_Oscilloscope_Service_Manual.pdf Tektronix 475 Manual (108MB file, good quality, PDF)]
|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
* [http://w140.com/tek_475a_schematics.pdf Tektronix 475A Schematics (PDF)]
|manuals=
* [http://w140.com/tek_475a_description.pdf Tektronix 475A Marketing Sales Release (PDF)]
'''475'''
* [[Media:TB-9-6625-2240-35.pdf|475 calibration (Army) (OCR)]]
* [[Media:070-1333-00.pdf|Tektronix 475 Operators Manual]] (OCR, 14MB, good quality)
* [[Media:070-2163-00.pdf|Tektronix 475A-DM44 Oscilloscope Instruction Manual (OCR, PDF)]]
* [[Media:070-1332-00.pdf|Tektronix 475 Service Manual]] (OCR)
''475A [[list of manuals that are needed|manual needed]] (no good quality free scan available)''
* [[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)


* [[Media:070-1332-00.pdf|Tektronix 475 Manual (65MB file, ok quality, PDF, OCR, bad-OCR)]]
* [[Media:tek_475_tek.pdf|Tektronix 475 Service Manual]] (65MB, OK quality)
* [[Media:tek_475a_block_diagram.pdf|Tektronix 475A Schematics (PDF, OCR, bad-OCR)]]
* [[Media:Tektronix_475_Oscilloscope_Service_Manual.pdf|Tektronix 475 Service Manual]] (108MB, good quality)
* [[Media:tek_475a_msr.pdf|Tektronix Marketing Sales Release (PDF, OCR, bad-OCR)]]
 
* [[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]]


====History====
* [[Media:Tek 465 and 475 marketing sales release.pdf|Tektronix 465 and 475 Marketing Sales Release (PDF)]]
}}
}}
The '''Tektronix 475''' is a portable dual-trace oscilloscope with dual time-bases similar to the [[465]],
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.
but with 200 MHz bandwidth and a maximum vertical sensitivity of 2 mV/Div.
It is all solid-state except for the CRT.  
It is all solid-state except for the CRT. It was introduced in November 1972.
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.


A revised version, the 475A, has 250 MHz bandwidth and a maximum vertical sensitivity of 5 mV/Div.
The [[1106]] is a battery pack for the 475.
The [[1106]] is a battery pack for the 475.


The optional [[DM44]] multimeter attaches to the top of the instrument.
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}}
{{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 | 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 | 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 44: Line 69:
{{Spec | Calibrator | 1 kHz, 30 mA / 300 mV square wave }}
{{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 | 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.)  }}
{{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}}
{{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==
==Internals==
Line 53: Line 102:
[[155-0082-00]] vertical output amplifier, and [[155-0049-00]] sweep control.
[[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=2SESaF7Ibbw Tek 475A in operation] @ YouTube
! 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====
==Common Problems==
The 475 series scopes use tantalum capacitors. They are known to short out and bring the scope down.
* See [[475/Repairs]]
Typical symptoms will be no trace, or powering on and going off in few seconds due to built in  foldback protection.
The shorted capacitor in the power rails will down one (or more) of them and causing entire scope to be non functional.


Quick way to troubleshoot is, after powering off and ensuring all capacitors are discharged, check resistance to ground on each power supply rail and identify the shorted power rail. Then trace the offending tantalum capacitor with the help of schematic.
==Pictures==


==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>
<gallery>
475A_1.JPG | Tektronix 475A
Tek 475m 1.jpg
Tek 475a front.jpg | Tektronix 475A
Tek 475m 2.jpg
Tek 475 mix mode.jpg|Tek 475 in mixed sweep ("MIX") horizontal mode
Tek 475m 3.jpg
Tek 475a dm44 trace.jpg|475A with [[DM44]]
Tek 475m 4.jpg
Tek 475 square sin.jpg|475
Tek 475m 5.jpg
Tek 475 rear.jpg|475 rear
Tek 475m 6.jpg
Tek 475a trace dm44.jpg|475A with [[DM44]]
Tek 475m 7.jpg
Tek 475 dual sine.jpg|475
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
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>
</gallery>
==Components==
{{Parts|475}}
{{Parts|475A}}
{{Parts|475M}}


[[Category:400 series scopes]]
[[Category:400 series scopes]]
[[Category:Specifications needed]]
[[Category:Manual needed]]

Latest revision as of 04:30, 11 March 2024

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 Vp-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 VAC ±10%, 48-440 Hz, max. 100 W

Links

Documents and reports

Documents Referencing 475

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

Videos

Zenwizard Studios

VintageTek Museum

Miscellaneous

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

Pictures

475

475A

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 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 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 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