Rothwell Simplex MM phono stage with discrete Class A circuit, 42 dB gain, precise RIAA equalisation and support for MM and high output MC cartridges. Read more.
The Rothwell Simplex is a moving magnet phono stage built for music lovers who want a serious vinyl upgrade in a compact and affordable form. It is positioned as an MM-only phono preamplifier and uses the same circuit and component selection as the MM section of the award-winning Rothwell Rialto, while leaving out the Rialto’s low output MC gain stage. This makes the Simplex a focused choice for turntables fitted with moving magnet cartridges or high output moving coil cartridges.
Rather than relying on a common op-amp layout, the Rothwell Simplex uses a fully discrete transistor circuit operating in Class A. Its design uses local feedback, careful PCB routing, star earthing and multi-stage power supply filtering to help preserve signal integrity and keep unwanted noise low. Polypropylene capacitors, 1% tolerance resistors and RIAA equalisation specified within 0.5 dB support a detailed, spacious and balanced sound. Key specifications include 42 dB gain, 47 kOhm plus 150 pF input loading and compatibility with 2 mV to 10 mV cartridges.
In a real-world hi-fi system, the Simplex sits neatly between a turntable and a line-level input on an integrated amplifier, preamplifier or receiver. Its external 24V DC power supply helps keep the audio circuit separated from mains-related interference, while the compact 60 x 155 x 92 mm enclosure is easy to place on a rack or shelf. Owners who later move to a low output MC cartridge can add a suitable step-up transformer. Choose the Rothwell Simplex for a clean, focused and practical MM vinyl upgrade.
