| Test | 12AE6A 12V 33 | 12AE6A 13,5V 33 | 12AE6A 15V 33 | 12AE6A 16.5V 33 |
| Frequency response (from 40 Hz to 15 kHz), dB: | +0.04, -0.14 | +0.04, -0.14 | +0.04, -0.13 | +0.04, -0.13 |
| Noise level, dB (A): | -90.5 | -90.6 | -90.6 | -91.0 |
| Dynamic range, dB (A): | 90.1 | 90.2 | 90.2 | 90.6 |
| THD, %: | 0.222 | 0.457 | 0.551 | 0.513 |
| IMD + Noise, %: | 0.221 | 0.424 | 0.541 | 0.508 |
| Stereo crosstalk, dB: | -68.8 | -68.9 | -69.2 | -69.1 |