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NVA amplifier cases are made entirely of non-magnetic acrylic materials. The sides are bonded together with acrylic weld and the top plate with structural adhesives to avoid the magnetic contamination of steel screws. Here's what NVA founder, Richard Dunn, said in 1992...
“It all started because when I first put the circuit together, I was listening to the amplifier in early bread boarded state, and I was very happy with the circuit. I designed a case, I put it in the case, and it was not as good. I could never understand this, so I started to investigate. The first thing I came up with was that it was steel that was the major problem. You see, a case of steel has a very strong effect on the sound. My theory on this is that there is a lot of magnetic field, that is not only coming off the transformer, but it comes off all AC circuits, comes off the capacitors, comes off the transistors. Now, with a steel case, it cannot get out of the amplifier, just bounces around inside, that turns the sound muddy and loses information.”