The invention relates to a cold component of a cryogenic cooler, in particular, for cooling electronic components. With this configuration, it is possible to provide a PLL circuit that achieves low power consumption and covers a wide range of oscillation frequencies. The dual curable coating may be a tinted top coat or a clear coat. The mixing apparatus extends into the semi-cylindrical concavity to substantially fill that concavity. A closure is operatively positioned with respect to the ink supply channel.