3A3
The Tektronix 3A3 is a dual trace differential amplifier for 560-series scopes. It was designed by Roy Hayes.
Key Specifications
| Bandwidth | 500 kHz or 5 kHz (switch-selectable) |
|---|---|
| Deflection | 0.1 mV/Div to 10 V/Div, in 1−2−5 steps |
| Input impedance | 1 MΩ // 47 pF |
Internals
Early 3A3s use a 7586 Nuvistor for the front end cathode follower. Serial numbers 4990 and up use a dual JFET.
Pictures
Older version (below SN 4990, Nuvistor in input stage)
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3A3 Front
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3A3 Right
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3A3 Left
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3A3, Nuvistor in Input Stage
Newer version (from SN 4990 up, FET in input stage)
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3A3 Front
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3A3 Right
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3A3 Left
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3A3 Top
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3A3 Bottom
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3A3, Dual JFET in Input Stage
