475
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 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 |
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
Common Problems
- See 475/Repairs
Pictures
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 |