Fidelity-Research FRT-3
(Released in September 1967)
¥ 15,800 (around 1970)
¥ 20,500 (around 1978)
Commentary
Step-up transformer for MC using toroidal core.
By developing and adopting a ring-shaped toroidal core, nonlinear distortion and noise components caused by hysteresis curve and Barkhausen effect are eliminated.
Model Rating
| Type | Booster transformer |
| Primary impedance | 10 Ω, 30 Ω, PASS (Switching) |
| Secondary impedance | 12k Ω |
| Load impedance | 47k Ω ~ 50k Ω |
| Boost ratio | 10 Ω : 31 dB (36 times) 30 Ω : 26 dB (21 times) |
| Frequency band | 20 Hz to 30 kHz |
| Distortion factor | Measurement error occurs until output 2 vrms and judgment is not made. |
| External dimensions | 64 mm wide x 64 mm high x 105 mm deep |