The new regulated bias supplies have much more output than the older bias supplies. I could operate the old bias supplies at 70 % (1:30 on the bias dial). The new regulated bias supplies on my new 560 base-focused panels start to pop on heavy bass material at 9:30 on the bias pot. So. Expect there will be a difference in the new bias pot setting. Your Altitude and humidity levels will affect the setting level.
Ken