Every GRAAF equipment originates from the experience and the creativity
of Giovanni Mariani, a designer who has spent most part of his
life studying and trying to understand the physical principles
that rule the operation of tubes. Even if the continuous advancement
in the electronics field has brought to the widest diffusion of
solid state equipments, that are often very effective, a musical
reproduction with no compromise for timbre and overall quality
rarely is able to leave apart from tubes.