Gyrodec mkIV

About the Gyrodec mkIV

The Michell Engineering Gyrodec MkIV is a legendary three-point spring-suspended turntable from the late 1990s era, featuring a high-mass suspended assembly for superior vibration isolation and precise speed stability. This specific unit has been modified by Gert Pedersen, a noted audio expert renowned for optimizing Michell turntables through custom upgrades such as improved suspension tuning, power supplies, and damping modifications to elevate performance beyond stock specifications. Key design elements include an inverted oil-circulating main bearing for minimal friction and rumble, an impedance-matched acrylic/vinyl composite platter with brass weights for enhanced inertia, a weighted pendulum-style aluminum sub-chassis (approximately 8kg), and a free-standing motor unit to eliminate vibrations. Post-1999 MkIV models incorporate split suspension turrets for independent height and spring orientation adjustment, tuning the vertical resonance to 2-3Hz. Compatible with a wide range of tonearms (e.g., Rega RB-300, SME Series IV/V, Zeta) via custom arm boards ensuring static and dynamic balance at 1kg total arm + board mass. Upgrades like HR-PSU, Orbe clamp, and Denso damp are common. No longer in production, but highly regarded for its modular upgradability and reference-level sound.