AI-generated product photo — not official manufacturer imagery.
FRT-4
Fidelity ResearchEstimated price (community-sourced)
Around — community and catalog average, updates slowly
About the FRT-4
The Fidelity Research FRT-4 is a highly regarded vintage step-up transformer (SUT) designed for moving coil (MC) cartridges, featuring separately encased toroidal transformers for each channel in a steel box with aluminum casing. Produced by Fidelity Research (1964-1984, Tokyo), it offers exceptional sound quality with extended treble, agile dynamics, transparency, and versatility for MC cartridges with coil impedances from 3Ω to 40Ω. It outperforms models like the FRT-3 and compares favorably to the Stevens & Billington TX103. Includes 3 switchable inputs and a bypass option. Internal resistors (18kΩ across secondary, 1MΩ partial) can be modified for sonic optimization. Recommended for pairing with phono preamps having 47kΩ input impedance, allowing optimal matching via adjustable primary load (10x-20x cartridge coil impedance).
Specifications
Analog Output
Analog signal output specifications
- Output Impedance
- 18000Ω
Phono Preamplifier
Phono stage specifications
- MC Gain
- 31 dB
- Adjustable Loading
- Yes
- Loading Options
- 3Ω, 40Ω
- Adjustable Capacitance
- No
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions