Hi everyone,
Torii manual states the following.... 

".... Operation and Setup 
To operate your amp, carefully install the tubes and hook up the output jacks to the 
speakers. Once you are sure the speakers and amp are securely connected together with a high quality RCA cable you may then plug the amplifier into the wall outlet.   
Before you turn it on make sure that both volume controls are turned all the way 
down...... "
Is it OK 
NOT to connect speakers?  I am planning to use the amp with headphones alone.
Any input much appreciated!