3A5
The Tektronix 3A5 is a 15 MHz "Automatic/Programmable Amplifier" plug-in for 560-series scopes. It can automatically seek and select a suitable deflection factor to display an unknown signal.
Range seeking is initiated through a switch on the unit, a button on the P6030 probe, or a signal through the PROGRAM connector (using a 263 programmer).
The 3B5 is a time base with similar features.
Key Specifications
| Deflection | 1 mV/Div to 50 V/Div , 1−2−5 |
|---|---|
| Bandwidth | 15 MHz (50 V/Div to 10 mV/Div), 5 MHz (5 mV/Div to 1 mV/Div) |
| Seeking circuit frequency range | 30 Hz to 20 MHz |
| Input impedance | 1 MΩ // 24 pF |
Links
- Tektronix 3A5 and 3B5 Automatic Seeking Mode @ YouTube
- Automatic / Programmable Plug-ins @ vintagetek.org
- Tek 3A5 @ barrytech.com
Documents Referencing 3A5
Pictures
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3A5 front
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3A5 gray front
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3A5 inside left
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3A5 inside right
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Manual mode block diagram
Components
Some Parts Used in the 3A5
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 7586 | 154-0306-00 | Vacuum Tube (Triode) | Nuvistor triode | M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311 |
| 8233 | 154-0361-00 | Vacuum Tube (Pentode) | special quality 10 watt pentode | 3A1 • 3A1S • 3A5 • 3A6 • 9A1 • 9A2 |