475

Tektronix 475

Portable 200 MHz dual-trace scope

Tektronix 475

Produced from 1972 to 1983

Manuals

475

Tektronix 475 Operators Manual (OCR, 14MB, good quality)
Tektronix 475 Service Manual (65MB, OK quality, needs re-OCR)
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

Tektronix 465 and 475 Marketing Sales Release
Tektronix 475A Marketing Sales Release (needs re-OCR)

(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 (12/24V input) on board.

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
Rise time	1.75 ns (475)
Deflection	2 mV/Div to 5 V/Div, 1−2−5
Cascaded mode	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

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.

Links

Lazy Electrons Tektronix 475A & DM44 Repair Page
The New Look in Portables, in Tekscope Vol. 4 No. 5, 1972
Tek 475 / Tek 475A @ amplifier.cd
Tek 475A / DM44 repair by vintageTek Museum @ YouTube
Tek 475A in operation @ YouTube
Tektronix 475A and DM44 Repair Power Supply and Logic by Zenwizard Studios @ YouTube
Tektronix 475A and DM44 Power Supply and Tube Alignment @ Zenwizard Studios YouTube
151-0367-00 Guaranteed Bad Parts @ Zenwizard Studios YouTube
Tektronix 475A Vertical Alignment and One Last Power Supply Issue @ Zenwizard Studios YouTube
Tektronix 475A Trigger Section Alignment @ Zenwizard Studios YouTube
Tektronix DM44 & 475A Horizontal Alignment by Zenwizard Studios @ YouTube

Handle Replacement Modification Kit

Common Problems

See 475/Repairs

Pictures

Tektronix 475A
Tektronix 475A
Tek 475 in mixed sweep ("MIX") horizontal mode
475A with DM44
475
475 rear
475A with DM44
475
475A Time/Frequency Measurement with DM44, HP Frequency Counter used for Verifying DM44 Output.
475A rear
475 (OS-261 C) rear, with DC-Input
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
475/DM44 measuring a 1 kHz sine wave
475/DM44 measuring a 10 kHz sine wave
475/DM44 measuring a 100 kHz sine wave

475M

Custom ICs used in the 475

Page	Class	Manufacturer	Model	Part nos	Description	Designers	Used in
155-0032-00	Monolithic integrated circuit	Tektronix	M55	155-0032-00 • 155-0032-01	variable-gain transconductance amplifier	Roy Hayes • Einar Traa	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	Monolithic integrated circuit	Tektronix	M079G	155-0049-00 • 155-0049-01 • 155-0049-02	sweep control with lockout	Bill DeVey	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B53N7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C
155-0078-00	Monolithic integrated circuit	Tektronix	M084	155-0078-xx • 155-0273-00 • 155-0274-00	broadband amplifier	John Addis	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	Monolithic integrated circuit	Tektronix	155-0082-00	155-0082-00	vertical output amplifier		475 • 475A
155-0085-00	Hybrid integrated circuit	Tektronix	H136	155-0085-00 • 155-0085-01	input amplifier		475 • 475A • 475M
155-0091-00	Monolithic integrated circuit	Tektronix	M095A	155-0091-00	channel switch / HF amplifier	Einar Traa • Jim Woo	475 • 475A • 475M
155-0217-00	Monolithic integrated circuit	Tektronix	M55D	155-0216-00 • 155-0217-00	variable-gain transconductance amplifier	Roy Hayes • Einar Traa	335 • 475 • 7D20 • FG504

Custom ICs used in the 475A

Page	Class	Manufacturer	Model	Part nos	Description	Designers	Used in
155-0032-00	Monolithic integrated circuit	Tektronix	M55	155-0032-00 • 155-0032-01	variable-gain transconductance amplifier	Roy Hayes • Einar Traa	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	Monolithic integrated circuit	Tektronix	M079G	155-0049-00 • 155-0049-01 • 155-0049-02	sweep control with lockout	Bill DeVey	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B53N7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C
155-0078-00	Monolithic integrated circuit	Tektronix	M084	155-0078-xx • 155-0273-00 • 155-0274-00	broadband amplifier	John Addis	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	Monolithic integrated circuit	Tektronix	155-0082-00	155-0082-00	vertical output amplifier		475 • 475A
155-0085-00	Hybrid integrated circuit	Tektronix	H136	155-0085-00 • 155-0085-01	input amplifier		475 • 475A • 475M
155-0091-00	Monolithic integrated circuit	Tektronix	M095A	155-0091-00	channel switch / HF amplifier	Einar Traa • Jim Woo	475 • 475A • 475M
155-0168-00	Hybrid integrated circuit	Tektronix	H126	155-0168-00	amplifier	Einar Traa	475A

475