Small wave Cross over distortion Saturation on the top and the bottom See how uneven the two halves are? Is this the uneven nature of the cathodyne phase inverter. Is the clipping in the PI? Taking it one step farther, is it saturation on top and cut off on the bottom, since the PI is not pushpull? It’s easy to see the size of the maximum clean wave as six grid lines, 5V per. The maximum wave is balanced. The maximum clean signal at the speaker, ignoring cross over distortion looks like 15 peak volts (calculated to be 10.6 RMs), measured 8.75 volts AC RMS on a DMM for 15 W or 10 W into a 7.5 ohm dummy load.