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.
The 465 was very popular and Tek made them for quite a few years.
It is all solid-state except for the CRT. It was introduced in November 1972.
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.
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 |
|---|---|
| Rise time | 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 | 154-0676-10 tube, P31 phosphor, 18.5 kV acceleration, 8 cm × 10 cm graticule |
| Line Voltage | 110/115/120/220/230/240 VAC ±10%, selected via primary voltage selector and regulating range selector assembly, 48 Hz to 440 Hz |
| Power Consumption | 75 W @ 115 VAC / 60 Hz |
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.
Links
- Rajesh's Tek 465 Repair
- The New Look in Portables, in Tekscope Vol. 4 No. 5, 1972
- Jim Williams repairs Tom Osborne's Tektronix 465B oscilloscope (YouTube)
- Another successful 465 repair, shorted tantalum (YouTube)
- Repairing a 465 (power supply, z axis amplifier, vertical pre amplifier issues) - nice internal photos
- Tek 465 page @ amplifier.cd
- 465B differences
- Tek 465 "teardown"
- Replacing Electrolytic Filter Capacitors in a Tektronix 465
- Tektronix T4650 CRT
- Handle Replacement Modification Kit
Common Problems
- See 465/Repairs
Pictures
465
465 Mod UC
465B
Custom ICs used in the 465
Custom ICs used in the 465B
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0032-00 | M55 | 155-0032-00 • 155-0032-01 | variable-gain transconductance amplifier (voltage in, current out) | 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 |
| 155-0115-00 | 155-0115-00 | 155-0115-00 | vertical amplifier | 335 • 464 • 465 • 465B • 466 • 468 |