Tektronix
321
Provisional entry — research in progress
This page was generated automatically from cited public sources and hasn't completed the full research pass yet. Every specification shown carries its source; more detail is added as research completes.
The Tektronix 321 is a portable oscilloscope. The Tektronix 321 could operate on AC line power or rechargeable batteries. The Tektronix 321 used a Nuvistor ceramic tube for the vertical amplifier input and was otherwise transistorized.[1]
Produced
1960–1972
Power
5 MHz[2]
What it is
The Tektronix 321 is an oscilloscope. Oscilloscopes are electronic test and measurement instruments that display voltage as a trace over time. The Tektronix 321 was a very compact portable single-channel scope. The Tektronix 321 was introduced on April 8th, 1960. The Tektronix 321 was produced from 1960 to 1972.[2]
How it works
The Tektronix 321 is a single-trace, single-timebase oscilloscope. The Tektronix 321 has a bandwidth of 5 MHz. The Tektronix 321 has a rise time of 70 ns. The Tektronix 321 sweep range is 0.5 μs/Div to 0.5 s/Div with a ×5 magnifier. The Tektronix 321 vertical deflection range is 10 mV/Div to 20 V/Div. The Tektronix 321 input impedance is 1 MΩ in parallel with 35 pF. The Tektronix 321 includes external trigger or X input support for X-Y displays and an external blanking input for Z modulation.[2]
Where it fits in the process flow
General reference — not yet source-verifiedOscilloscopes are bench and field diagnostic instruments rather than process tools. In electronics development, manufacturing, maintenance, and lab work, an oscilloscope fits around equipment bring-up, troubleshooting, calibration, and verification, where it is used to observe live electrical behavior without becoming part of the product flow itself.
Applications
The Tektronix 321 supports X-Y displays through its external trigger or X input. The Tektronix 321 also provides external blanking input for Z modulation. The Tektronix 321 included a built-in battery.[2]
Why won't it start?
Documented failure modes, common issues, and field considerations.
- The 321 includes several germanium bipolar transistors, which are described as a known reliability problem.
- Early instances of the 321 used a 5718 peanut tube as the front-end cathode follower.
What do the numbers mean?
Power & electrical1
Configuration & options10
Vintage & configurations
- 1960Production start[2]
The 321 was introduced on April 8, 1960.
- 1961introductory note[1]
Tektronix sold its first completely portable oscilloscope, the Model 321, in 1961.
- 1961Production start[1]
Tektronix sold its first completely portable oscilloscope, the model 321, in 1961.
- 1972Production end[2]
The 321 was produced to 1972.
Documented models & variants
| Designation | Generation | Vintage | Changes | Source |
|---|---|---|---|---|
| 321A | — | — | described as the all-transistor model introduced about a year and a half after the 321 | en.wikipedia.org[1] |
What replaced it?
Related models
- successorTektronix 321A— Model 321 was the portable precursor; 321A came out about a year and a half later.source[1]
- successorTektronix 323— 300 series replaced the model 321 oscilloscopesource[1]
What does it need to run?
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
- Bandwidth5 MHz[2]
Where are the manuals?
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
Not publicly documented
Field notes
No research found yet — worked with this tool? Share what you know.
Frequently asked questions
When was the Tektronix 321 introduced?
The Tektronix 321 was introduced on April 8th, 1960.[2]
How is the Tektronix 321 powered?
The Tektronix 321 could operate from AC power, external DC power, or an internal battery. The battery configuration used ten size D NiCd cells.[2][3]
What are the main bandwidth and rise-time specifications of the Tektronix 321?
The Tektronix 321 has a bandwidth of 5 MHz and a rise time of 70 ns.[2]
What display and input features does the Tektronix 321 provide?
The Tektronix 321 is a single-trace, single-timebase oscilloscope. The Tektronix 321 supports external trigger or X input for X-Y displays and provides an external blanking input for Z modulation.[2]
Not publicly documented
The following facts about the 321 are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
The control-system platform and OS era of the 321 are not on record.
Answerable by: an engineer who operated it or OEM installation records
The process node or technology generation of the 321 is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 321 are on record.
Answerable by: an OEM parts catalog or a service engineer
No publicly hosted manuals, SOPs, or datasheets for the 321 are on record.
Answerable by: university cleanroom staff or an OEM application specialist
Sources & citations
Sources (3)Every fact above is drawn from these public sources
- [1]en.wikipedia.org — en.wikipedia.orgen.wikipedia.org
- [2]w140.com — w140.comw140.com
- [3]321 Oscilloscope | Vintage Oscilloscope at Vintagetek — vintagetek.orgvintagetek.org
Last updated Oct 19, 2026.
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