Table 6
Power output triodes
| Make | Type | Base | Fil. volts | Fil. amps | Anode volts | Impedance | Slope(mA/V) | Bias volts | Anode current (mA) | Bias res. (ohms) | Output (mW) | Optimum load (ohms) |
| Brimar | PA1 | 5B15 | 4.0 | 1.1 | 200 | 1500 | 12.0 | − 9.0 | 50.0 | 260 | 1250 | 4 000 |
| Cossor | 215P | 4B4 | 2.0 | 0.15 | 150 | 4 000 | 2.25 | − 7.5 | 10.0 | – | 150 | 9 000 |
| 220P | 4B4 | 2.0 | 0.2 | 150 | 4 000 | 2.25 | − 7.5 | 11.0 | – | 190 | 9 000 | |
| 220PA | 4B4 | 2.0 | 0.2 | 150 | 4 000 | 4.0 | − 4.5 | 10.0 | – | 180 | 9 000 | |
| 230XP | 4B4 | 2.0 | 0.3 | 150 | 1500 | 3.0 | − 18.0 | 22.0 | – | 450 | 3 500 | |
| 2P | 4B4 | 2.0 | 2.0 | 250 | 1150 | 7.0 | − 22.0 | 40.0 | – | – | 3 000 | |
| 2XP | 4B4 | 2.0 | 2.0 | 300 | 900 | 7.0 | − 36.0 | 50.0 | – | – | 4 000 | |
| 41MP | 5B15 | 4.0 | 1.0 | 200 | 2500 | 7.5 | − 7.5 | 24.0 | 320 | 1250 | 3 000 | |
| 41MXP | SB15 | 4.0 | 1.0 | 200 | 1500 | 7.5 | − 12.5 | 40.0 | 300 | 2 000 | 2 000 | |
| 4XP | 4B4 | 4.0 | 1.0 | 250 | 900 | 7.0 | − 28.5 | 48.0 | 600 | 3 000 | 3 000 | |
| DP | 7B18 | 16.0 | 0.25 | 200 | 2 800 | 6.0 | − 7.5 | 25.0 | 300 | – | 3 500 | |
| 402P | 7B18 | 40.0 | 0.2 | 200 | 1330 | 7.5 | − 9.5 | 30.0 | 320 | – | 2 500 | |
| Dario | TB052 | 4B4 | 2.0 | 0.15 | 150 | 4200 | 1.2 | − 18.0 | 7.0 | – | 150 | 11000 |
| TB062 | 4B4 | 2.0 ... |
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