Watts! How many do we need?

@jfrmusic not sure about OP question.. Accuphase P4600 (congrats, it’s a good amp!) has output power indicators, which should help you to determine if you reach limit and need more Watts!

@jfrmusic Accuphase output meters are accurate, you drive y’r amp at very low power, accordingly to Accuphase design P4600 is a class A amp till ~20W. You may crank it up to the max to see full power range!

@jfrmusic I looked amp spec and schematics. A/B class P4600 increased idle power and number of output transistors to 12 in each channel, matching their A class amps. 20W is estimate of peak power for linear output transistors range, for both channels combined (2x10W)

@jfrmusic 6 transistors / leg, 12 total pnp-npn power devices per channel. I calculated A class wattage using p4600 schematic. 

@jfrmusic spec with design details for p4600 https://www.accuphase.com/cat/p-4600_e.pdf 

@jfrmusic it was noted here in my post above.. you may ask Accuphase support and update us on their  detailed spec details for this AB amp design! 

@ifrmusic thanks for asking Accuphase support! being advanced analog circuit designer it’s not hard for me to estimate AB class amp linear (A class) range, sorry for not explaining to you all boring details of my calculation, which could be lengthy!