| Test | Millett Hybrid 12AE6A+DB 13.5V 15mA 33 | Millett Hybrid 12AE6A+DB 13.5V 20mA 33 | Millett Hybrid 12AE6A+DB 13.5V 25mA 33 |
| Frequency response (from 40 Hz to 15 kHz), dB: | +0.05, -0.16 | +0.05, -0.16 | +0.05, -0.17 |
| Noise level, dB (A): | -89.6 | -90.1 | -90.2 |
| Dynamic range, dB (A): | 89.2 | 89.6 | 89.6 |
| THD, %: | 0.520 | 0.551 | 0.547 |
| IMD + Noise, %: | 0.486 | 0.516 | 0.512 |
| Stereo crosstalk, dB: | -73.0 | -72.8 | -74.1 |