ADK CS-1 Details Class A (Discrete) 9 Polar-Pattern Tube (Valve) Condenser Microphone built as a "One-Off" using Customize Belgium-Design PC Board built with Hi-Fi Methods and Materials, using a "No-Corners-Cut" Approach. Features German Hand-Selected Valve, Top-of-the-Line Components (including a $3 Resistor) and your choice of Capsule from the Custom Shop "Capsule-Bank". Based on ADK's Area 51 TT Chassis, this is a totally Customized Product built "One-Off" for each client based on one's preference for Historical (Vintage) Microphone Response Characteristics.