Take care NOT to touch the diaphragms of the capsule. Once the black piece has been moved aside, the two round grille pieces can be lifted or dropped off of the center ring. Set these screws aside they will be needed for re-assembly. This will free the round capsule housing from its black base. Remove the two screws indicated in the photo at right.
One of the two is indicated by a red arrow in the photo at right. Remove the two screws that connect the mic chassis to the capsule housing assembly. If you are using the stock Luna circuit, photograph the wire positions first, or you will not know how to solder the new capsule's wires later. The first step (not pictured) is to desolder the two capsule wires from the circuit board. M-Audio Luna Capsule Replacement Instructions This kit is based on our popular T-84 circuit kit, which is the heart of our best-selling transformer microphone kit. This circuit kit contains very high-grade components, including a NOS transistor, US-made output capacitors, polypropylene filter caps, and a custom-wound transformer. The T84-55 is a single-stage JFET/transformer circuit, based on Neumann's KM84. See below for specific capsule installation instructions for the Luna. The RK-12 works equally well with our T84-55 circuit. It has a broader, lower amplitude presence boost in the high frequencies, giving the a much more balanced sound than does the original capsule. The RK-12 is an alternative replacement/upgrade capsule for the Luna. It is better suited to the stock circuit than is the Luna's original capsule, and it pairs beautifully with our T84-55 circuit also (see below).
The RK-47 is a fine replacement/upgrade capsule. Because the mic's circuit is linear, the Luna sounds too bright and hyped on many sources. This capsule suffers from a significant and harsh-sounding presence peak around 11kHz. The capsule in the GT55 is K67 type, very similar to what you'd find in most of the large-diaphragm condensers made by MXL, Behringer, CAD, Apex, etc. We have two modification options for the Luna microphone: #1: Capsule Replacement The mic has relatively high output, but relatively high noise, and a slightly over-bright voicing that limits the microphone's utility. The circuit is a simplified version of what we first saw in the Groove Tubes GT55, although without a switchable pad or high-pass filter. M-Audio Luna Mods The M-Audio Luna is a large-diaphragm FET condenser with a transformer-coupled circuit.
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