Given the truly high performance capabilities of this kit, we believed that we would be remiss if we did not advance the Atma-Sphere kit to the limit of its design threshold by not using our best hook up wire. The same comments hold true for the solder developed by George Cardas of Cardas Audio. We feel his Cardas Quad Eutectic Solder is without peer. So, JENA LABS wire and Cardas solder were used. Jennifer and I resisted the temptation to make circuit changes or substitute other parts.
Nothing can do that.
The kit comes with all of the tubes used in this amplifier, including 4 spare 6AS7 tubes for the output section. The availability of both tube types is legion, have no fear, and they are very available. They are often used in power regulation circuits, and are ideal for the use in output transformer-less designs such as this. Because they are currently made in large volume, they are relatively inexpensive, between 15 and 20 dollars each. The 6SN7 driver tubes are one of the most common tubes ever created.