Power Conditioner -vs- Voltage Regulator, your amp knows the difference

While touring in Texas, our band frequently played small rural venues where the AC power provided was at best questionable and Tube amps will react to incoming voltage drops from the wall outlet. A substantial low voltage drop will make a tube amp sound strange i.e., " what is wrong with my power amp ? it sounds weird".

The bass player had a rack mount power-conditioner that was supposed to condition the power, but after plugging in to it  …  Hmmm …  not so much.

After further investigation, I finally purchased a Voltage-Regulator by Furman Sound, the AR-1215, that actually grabs hold of the voltage and adjusts the incoming AC line voltage if it varies more than a few percent from the standard 117 volts.

Problem solved