3A8: Difference between revisions
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* [ | * [[Media:070-0507-00.pdf|Tektronix 3A8 Manual]] | ||
* [[Media:Tek type 3a8 irb.pdf|Tektronix 3A8 Instrument Reference Book ( | * [[Media:Tek type 3a8 irb.pdf|Tektronix 3A8 Instrument Reference Book]] (OCR) | ||
}} | }} | ||
The '''Tektronix 3A8''' is an operational amplifier plug-in for [[560-series scopes]]. | The '''Tektronix 3A8''' is an operational amplifier plug-in for [[560-series scopes]]. | ||
Revision as of 10:28, 14 October 2022
The Tektronix 3A8 is an operational amplifier plug-in for 560-series scopes. It was designed by Roy Hayes.
Key Specifications
| Display Amplifier Bandwidth | DC to 3.5 MHz |
|---|---|
| Display Amplifier Sensitivity | 20 mV/cm to 10 V/cm |
| Opamp Gain Bandwidth Product | ≥10 MHz |
| Opamp DC Open Loop Gain | ≥ 10,000 |
| Opamp Output | ≥ ± 25 V driving ≥ 7.5 mA (including feedback current) |
| Opamp Features | Input and feedback resistances and capacitances are separately switch selectable to provide a variety of opamp functions.
External components can be substituted by way of front panel banana sockets which also accept special purpose adapters (see Accessories). |
Internals
The 3A8 contains one vertical display amplifier and two operational amplifiers.
The 3A8 display amplifier can accept inputs from the output of either operational amplifier or from an external input. The input can be AC or DC coupled and can be inverted if desired. It has several transistors plus three 9-pin miniature vacuum tubes: an 8416 and two 6KV8s.
Each 3A8 operational amplifier can accept external inputs and has external as well as internal outputs. Each operational amplifier has a number of transistors plus three Nuvistors: a 6CW4 and a selected pair of 7586s.
Accessories
- 013-0049-01 Standard Shielded Cover (two supplied with each plugin)
- 013-0048-01 Terminal Adapter Assembly (empty box for user chosen components)
- 013-0081-00 Compensating Adapter
- 013-0068-00 Gating Adapter
- 013-0086-00 Leakage Current Adapter
- 013-0067-00 Logarithmic Amplifier Adapter
Calibration Fixtures
- 067-0507-00 Grid Current Checker
Pictures
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Front, no plugin covers
-
Front view, w/shield covers
-
3A8 Left side
-
3A8 Right side
Some Parts Used in the 3A8
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 6CW4 | 154-0323-00 | Vacuum Tube (Triode) | Nuvistor triode | 1A7 • 3A8 • 3B2 • 3S76 • 6R1 • 565 • S-311 |
| 6KV8 | 154-497 • 154-0497-00 | Vacuum Tube (Triode/Pentode) | triode-pentode combo | 3A8 |
| 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 |
| 8416 | 154-0413-00 • 157-0116-00 | Vacuum Tube (Dual Triode) | dual triode | 1S1 • 2A61 • 3A8 • 3L5 • W |