Georg Fisher / Signet Scientific TK7Ea Dual Magnet Stereo Phono Cartridge

The Georg Fischer / Signet Scientific TK7Ea is a dual magnet stereo phono cartridge designed for high-fidelity analog playback. Two independent permanent magnets mounted at 45° to the record surface and perpendicular to groove walls function as separate electrical generators, each producing a distinct channel signal. This architecture maximizes stereo separation while the reduced effective mass of the moving system - achieved through compact magnets positioned near the stylus fulcrum and lightweight cantilevers - delivers detailed reproduction and minimizes groove wear.

Technical Specifications Construction & Geometry

Dual independent permanent magnet system

Magnets positioned at 45° to record surface, perpendicular to groove walls

Associated pole pieces and electrical coils for signal generation

Cantilever: lightweight aluminum alloy or beryllium construction

Stylus tip: Special elliptical diamond with platinum bonding

Cantilever type: straight pipe alloy or thin-wall alloy tubular design Performance & Channel Characteristics

Channel separation: minimum 33 dB at 1 kHz

Tracking force range: 0.75–1.75 g

Each magnet operates as independent electrical generator for respective channel

Key Features Dual magnet architecture enables precise groove wall translation into independent left/right signals. Platinum-bonded elliptical diamond stylus optimizes contact geometry for both groove walls simultaneously. Low moving mass reduces stylus pressure on vinyl surfaces, extending record and stylus life.

Typical Applications High-fidelity analog playback systems requiring accurate stereo imaging and minimal surface noise. Professional and audiophile turntable installations where channel separation and tracking accuracy are critical.

Compatibility & Integration Designed for standard half-inch mount configuration. Original replacement stylus: TKN3Ea. Cross-compatible styli include LP Gear AIN20SE and Audio-Technica ATN120E.