Most of the world runs at higher voltage levels than we here in North America. 230 volts is somewhat the standard worldwide with the exceptions being Taiwan, Japan, Mexico, and North America (and a few acres of Brazil). Which leaves our group as the odd countries out.
So how does a BHK amplifier, or any product for that matter, sound running at higher voltage?
The same because it really isn’t running at a higher voltage. It just seems like that.
Here’s where people get confused. Our equipment’s circuits always run at identical levels regardless of the source voltage. The power transformers inside our equipment perform what might at first seem like a feat of magic. Without any physical connection between the transformer’s input and its output, one voltage is transformed into another (hence the term transformer). Definitely more than meets the eye.
This miraculous transformation happens magnetically: Invisible force lines of energy. Transformers are little more than coils of wire and hunks of iron: One coil for the input, another for the output. The number of loops within a coil determine its voltage. Thus, the output of a transformer has a fixed number of loops, while the input coil’s loop numbers vary depending on what country it is being used in.
From our stereo circuit’s perspective the voltage feeding it never varies, nor does its performance.