| Application | 300B & equivalents |
| Primary Impedance | 2.49 kohm |
| Secondary Impedance | 4 + 8 ohm |
| Turns Ratio Np/Ns (4 ohm secondary) | 24.96 |
| -0.1 dB Frequency Range | 23 Hz - 22 kHz |
| -1 dB Frequency Range | 10 Hz - 49 kHz |
| -3 dB Frequency Range | 5 Hz - 91 kHz |
| Nominal Power, RMS | 13 W |
| Full Power Bandwidth starting at | 20 Hz |
| Total Primary Inductance | 18 H |
| Primary Leakage Inductance | 5.5 mH |
| Effective Primary Capacitance | 1 nF |
| Saturation Primary DC current | 204.32 mA |
| Total Primary Resistance | 40 ohm |
| Total Secondary Resistance | 0.1 ohm |
| Tube Plate Resistance (300B) | 0.7 kohm |
| Insertion Loss | 0.18 dB |
| Q-factor 2nd order HF roll-off | 0.49 |
| HF roll-off Specific Frequency | 147.21 kHz |
| Quality Factor (Lp/Lsp) | 3273 |
| Quality Decade Factor | 3.52 |
| Tuning Factor | 5.49 |
| Tuning Decade Factor | 0.74 |
| Frequency Decade Factor (note 4) | 4.26 |
