| Name of Tubes | Eg V rms | RL LOAD ohm |
| 2A3 | -45 | 2.5 K |
| 6A3 | -45 | 2.5K |
| 6B4G | -45 | 2.5K |
| WE300B | -75 | 2.7K |
| 45 | -56 | 3.5K or 5K |
| UX12 | -15 | 10K |
| UX71A | -40 | 4.8K |
| 50 | -84 | 4.35K |
| WE104D | -20 | 5.0K |
| WE271A | -30 | 3.0K |
| WE275A | -45 | 2.5K |
| VT62 | -45 | 8.0K |
| VT52 | -43 | 3.8K |
| 845 | -145 | 9.0K |
| 211 | -80 | 9.0K |
| PX25 | -30 | 5.5K |
| PX4 | -45 | 3.5K |
| 6550 | -16 | 3.0K |
| EL34 | -13 | 2.5K |
| 807 | -20 | 6.0K |
| 6L6GC | -14 | 2.5K |
| EL86/6CW5 | -12 | 2.4K |
| 6Y6 | -14 | 2.6K |
| 6V6/6AQ5/7C5 | -12.5 | 5.0K |
| 6BQ5/EL84 | -8.4 | 4.5K |
| KT88 | -16 | 3.0K |
| ECL82/6BM8 | -6.6 | 5.6K |
| KT66 | -15 | 2.2K |