| Model SD-40/80
| | Systron Donner
| | Concord, California
|
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| Operating range: | +/- 100 volts DC |
| Features (SD-40): | 40 total amplifiers consisting of: |
|   | 14 integrators, |
|   | 14 summers, and |
|   | 12 inverters |
|   | 65 Coefficient potentiometers |
| Features (SD-80): | 80 total amplifiers consisting of: |
|   | 28 integrators, |
|   | 28 summers, and |
|   | 24 inverters |
|   | 125 Coefficient potentiometers |
|