Provided is a DA converter circuit which copes with high-bit digital signals and has favorable linearity and small occupation area. The display device includes a candle container and a display panel attached to the wall of the candle container by a stand-off. A first set of conductors of a first material and design carry low-frequency signals between the base and terminal connector packages. The process gas preferably contains both hydrogen gas and water vapor, although the primary constituent is hydrogen gas. The quench ring including an annular manifold having a radius, an annular channel coupled in flow communication with said manifold, and at least one inlet coupled in flow communication with said manifold, said at least one inlet having a center line aligned substantially tangentially to said annular manifold.