| Mfr. Part No. | Description |
| 140A | Nominal Impedance (Ohms), Primary, 4 |
| 140B | Nominal Impedance (Ohms), Primary, 30 |
| 140C | Nominal Impedance (Ohms), Primary, 50 |
| 140H | Nominal Impedance (Ohms), Primary, 10000 |
| 140K | Nominal Impedance (Ohms), Primary, 150 |
| 140M | Nominal Impedance (Ohms), Primary, 100K |
| 140N | Nominal Impedance (Ohms), Primary, 50 |
| 140P | Nominal Impedance (Ohms), Primary, 150/600 |
| 140Q | Nominal Impedance (Ohms), Primary, 600 ct |