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. 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

465 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.

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
• 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

Common Problems

• See 465/Repairs

Pictures

465

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465 OPT 4

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465 OPT 7

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465 Mod UC

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465B

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  Interface board

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  (camera flash used)