Being early MOS technology, the Technics MN6042 Pitch Synthesizer IC is by far the most failure prone IC in the turntables that use it. Further, at their current age, even working MN6042 ICs typically are not working well due to gate damage sustained over their lifetime.
In our testing of three different Technics ICs, we found all three exhibited an average frequency variation of 8Hz, which directly affects the Quartz Lock frequency of the turntable, leading to increased flutter. With today’s technology, we can do far better.
The Fidelis Analog FA6042 Pitch Synthesizer is a drop-in replacement for the original Technics part, designed for absolute reliability and vastly improved performance. Our Pitch Synthesizer is stable to +0.1/-0.2Hz, making the Quartz Lock reference stable to +/-0.00003Hz as measured in our SP-10 MK3.
*NOTE: The SP-15 and all supported SL turntables use a current-limiting resistor in the supply for the MN6042. As the FA6042 draws more current, this resistor will need to be changed. An appropriate resistor will be included with your upgrade.
On the SP-10 MK3, R301 should be replaced with a jumper.