465

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. Bill Turner worked as a calibration technician for the 465 oscilloscope group.

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Portable 100 MHz dual-trace scope

Produced from 1972 to 1983

Manuals

Tektronix 465B Trigger Generator Schematic (PDF, OCR)

Modifications

040-0968-01: 465 Opt.7 External DC Operation (1982)
040-0814-02: Installation of DM44 on 465 B052300 - B251074
040-0815-01: Installation of DM44 on 465 B251075 & up
040-0944-00: Installation of DM44 on 465B
050-1627-00: S1150 (Time/cm switch) replacement

(All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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.

The optional DM44 multimeter attaches to the top of the instrument.

Key Specifications

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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
Maximum Input Voltage	500 V DC (250 V_DC when DC coupled) + Peak AC or 500 V_p-p AC at < 1 kHz
Trigger Coupling Modes	DC, AC, LF Reject, HF Reject
Channel Isolation	100:1 at 25 MHz
Z Axis Input	5 V_p-p signal causes noticeable modulation at normal intensity
Z Axis Frequency response	DC to 50 MHz
Output Signals	CH1 Vertical, A & B +Gate
Calibrator Output	~1 kHz, 300 mV, square wave
CRT Graticule Area	8 cm × 10 cm
CRT Phosphor	P31
CRT Accelerating Potential	18.5 kV
Line Voltage	110/115/120/220/240 V_AC ±10%, selected via primary voltage selector and regulating Range range selector assembly, 48 Hz to 440 Hz.
Power Consumption	75 W @ 115 V_AC / 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. The CRT is part number 154-0676-10.

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