Just buy more power than you will ever need.
Too much is good, not enough is terrible.
Other considerations which may mean a lot after you find out..
Class A. Remember the power bill will go way up, plus plenty of heat.
Plenty of heat added from having a tube amp also.
Generally the IDLE wattage of the amp in the measurements will tell you the efficiency.
Do you want to leave the amp on 24/7? Then a Solid State amp is required.
Remember tubes need attention.
What are the impedance of the speakers? 8 ohm or 4 ohm?
If 4, you need to check the 4 ohm rating. Some double, other no where near double power to 4 ohms from 8
Too much is good, not enough is terrible.
Other considerations which may mean a lot after you find out..
Class A. Remember the power bill will go way up, plus plenty of heat.
Plenty of heat added from having a tube amp also.
Generally the IDLE wattage of the amp in the measurements will tell you the efficiency.
Do you want to leave the amp on 24/7? Then a Solid State amp is required.
Remember tubes need attention.
What are the impedance of the speakers? 8 ohm or 4 ohm?
If 4, you need to check the 4 ohm rating. Some double, other no where near double power to 4 ohms from 8