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.
