465
- Note: The Tektronix 465M scope has its own page.
The Tektronix 465 is a portable 100 MHz dual-trace oscilloscope with dual time-bases, introduced in November 1972. It is all solid-state except for the CRT. The 465 was very popular and Tek made them for quite a few years. According to microfiche records, 37 variations of the 465 were produced.
There was no 465A but a 465B (int. 1980) with the same base specs but improved performance. The 475 is a 200 MHz sister model. See also 465M.
The optional DM44 multimeter attaches to the top of the instrument.
From Tekscope Vol. 4 No. 5, 1972 :
Initial product planning and project coordination was provided by Leon Orchard. The mechanical design team for the 465 and 475, headed by Bob Rossman, was: Neal Broadbent, Bob Leith, Len McCracken, Bob Smesrud, Ilmars Smiltins, and Bob Twigg. Ken Holland and Bill Mark provided the attenuator design while Bob Johnson designed the P6065 and P6075 probes. Low-voltage power supply for the 465/475 was by George Ermini, and Dennis Braatz designed the high-voltage supply. Connie Wilson and Gary Nelson did the CRT development.
Electrical design team assisting R. Michael Johnson in development of the 465 was: Frank Dewater, Pete Janowitz, Dave Laib, Al Schamel, and Bert tenKate.
Bill Turner worked as a calibration technician for the 465 oscilloscope group.
Key Specifications
| Bandwidth | DC to 100 MHz on CH1 & CH2 for −15°C to +40°C and DC to 85 MHz from +40°C to +55°C |
|---|---|
| Risetime | 3.5 ns for 0°C to +40°C and 4.2 ns from +40°C to +55°C |
| Input impedance | 1 MΩ ±2% // 20 pF |
| Input voltage | max. 500 V DC (250 VDC when DC coupled) + Peak AC or 500 Vp-p AC at < 1 kHz |
| Trigger coupling | DC, AC, LF Reject, HF Reject |
| Channel isolation | 100:1 at 25 MHz |
| Z-Axis input | DC to 50 MHz; 5 Vp-p signal causes noticeable modulation at normal intensity |
| Output signals | CH1 Vertical, A & B +Gate |
| Calibrator | ~1 kHz, 300 mV, square wave |
| CRT | T4650 (154-0676-00/154-0676-05/154-0676-10) tube, P31 phosphor, 18.5 kV acceleration, 8 cm × 10 cm graticule |
| Power | 110/115/120/220/230/240 VAC ±10%, selected via primary voltage selector and regulating range selector assembly, 48 Hz to 440 Hz; 75 W |
Options
| Opt | Tek catalogue name | Description |
|---|---|---|
| 4 | EMI Environmental | Adds filter circuits and Faraday mesh+ground contact spring in place of acrylic implosion window. |
| 5 | TV Sync Separator | This option has a separate service manual. |
| 7 | EXT DC Operation | DC Power Input. Adds rear socket, power selector switches and inverter module. Not available with DM43 or DM40. |
| 78 | P11 Phosphor | Replaces P31 phosphor 154-0676-10 with P11 version 154-0676-14. |
Links
- Rajesh's Tek 465 Repair
- Jim Williams repairs Tom Osborne's Tektronix 465B oscilloscope (YouTube)
- Another successful 465 repair, shorted tantalum (YouTube)
- Tek 465 page @ amplifier.cd
- 465B differences
- Tek 465 "teardown"
- Replacing Electrolytic Filter Capacitors in a Tektronix 465
- Zenwizard Studios - Power Supply and Tube Calibration
- Zenwizard Studios - Vertical Amplifier Calibration (Full)
- Zenwizard Studios - Trigger and Timebase Calibration (Full)
- Zenwizard Studios - Extensive Board Removal (All but Main board)
- 465 Mod UC by vintageTek Museum @ YouTube
Documents Referencing 465
| 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 N1.pdf | Article | Servicing the 465 Portable Oscilloscope | 1974 | 465 | |
| Tekscope 1974 V6 N4.pdf | Article | The Oscilloscope with the Digital Multimeter | Dennis Bratz | 1974 | DM43 • 465 |
| Tekscope 1975 V7 N3.pdf | Article | A Potpourri of Modifications and Service Hints | 1975 | 465 • 5L4N • 464 • 466 • 575 • 576 • 577 • TM504 |
Documents Referencing 465B
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1979 V11 N2.pdf | Article | Updating the Industry-Standard 100 MHz Portable Oscilloscope | Harold Busch | 1979 | 465B |
Prices
| Year | 1973 | 1976 | 1980 (B) | 1982 (B) | 1983 |
|---|---|---|---|---|---|
| Catalog Price | $1,725 | $2,095 | $2,600 | $2,995 | |
| In 2023 Dollars | $12,000 | $11,300 | $9,700 | $9,600 |
Internals
The 465 uses tunnel diodes with Tek part number 152-0125-00, which are equivalent to TD3A, and 155-0032-00 chips (their -01 grade) as trigger amplifiers.
Common Problems
- See 465/Repairs
Pictures
465
465 OPT 4
465 OPT 7
465 Mod UC
465B
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Interface board
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(camera flash used)
Components
Some Parts Used in the 465
Some Parts Used in the 465B
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 154-0731-00 | 154-0731-00 | CRT | CRT | Telequipment D75 • 455 • 465 • 465B • 468 |
| 154-0731-04 | 154-0731-04 | CRT | CRT | 465 • 465B |
| 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 |
| 155-0115-00 | 155-0115-00 | Hybrid integrated circuit | vertical amplifier | 335 • 464 • 465 • 465B • 466 • 468 |
| SKA6516 | 151-0367-00 | Discrete component | NPN Transistor | 465 • 465B • 466 • 475 |