465

Manuals – Specifications – Links – Pictures

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.

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	154-0676-00/154-0676-05/154-0676-10 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
• 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)

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