GT Electronics and Alesis have join forces and have introduced two new solid-state and two new tube large diaphragm condenser microphones. The fixed cardioid AM51 (MSRP $549) and multi-patterned AM52 (MSRP $699) are FET large-diaphragm condenser microphones. The field effect transistor (FET) circuitry in the AM51 and AM52 provide transparent sound, with extremely low distortion and self-noise. The 3-micron, gold evaporated mylar diaphragm on the AM51 and AM52 offers excellent sensitivity and allows matching between pairs of mics. Both microphones offer high sound pressure level (SPL) handling, a switchable - 10dB attenuation pad, and a switchable low frequency roll-off at 80Hz.

The AM61 (MSRP $999) and AM62 (MSRP $1299) are tube condenser mics with extra-large capsules with a super-thin (3 micron) gold evaporated mylar diaphragms. Each diaphragm is precisely tensioned to ensure an extremely close matching of capsule response and, along with the internal polarization voltage regulator, ensure a mirror response that's typically within one decibel between microphones.

The key element of both the AM61 and AM62 is their custom-designed, hand-selected dual triode vacuum tube, which produces ultra-low self-noise, broad frequency response and wide dynamic range. All four mics come with custom hard-shell cases and hard mounts while the AM61 and AM62 also include external power supplies, shock mount and a special 6-pin interconnecting cable.