AGD Productions Inc is the new kid on the high-end audio block. The brainchild of Alberto Guerra, AGC Productions Inc produces products that are distinctive and different from the competition.
For one, their amplifiers use their proprietary GaNTubeTM technology. A friend of mine mentioned, "It looks like a tube, lights up like a tube, and sounds like a tube". The photo of the GaNTubeTM below shows that a transistor based circuit housed in a vacuum tube like envelope. From the octal base, to the getter flashing on top, this looks like a typical 6550 or KT88 tube.
The GaNTubeTM is a class D circuit, utilising Gallium Nitride MOSFET transistors in lieu of conventional silicon transistors. Gallium Nitride is being touted as the next big thing in semiconductor manufacturing, boasting superior performance in more compact packages. They are superior in terms of power efficiency, thermal stability, RF production and immunity.