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About the SFM-75
The Sonic Frontiers SFM-75 is a mono tube power amplifier originally designed by Joe Curcio and introduced in 1989. It delivers 75 watts RMS into 8 ohms with a frequency response from 5 Hz to 60 kHz (+0.5 dB at 1 watt into 8 ohms). The amplifier uses a valve complement of 2 x KT88 power tubes and 2 x 6DJ8 tubes. It has an input sensitivity of 1.4V RMS at 1 kHz for full power output and an input impedance of 475 kOhms. The unit weighs approximately 45 lbs and measures 18 x 14.5 x 9 inches. The SFM-75 is noted for its thoughtful design, high-quality parts, and attractive pricing, making it a respected product in the high-end audio community. It was later succeeded by the SFM-75 MK-II model with similar specifications but updated styling and components. The amplifier is a classic example of a high-performance tube mono block amplifier suitable for audiophiles seeking detailed and powerful tube sound reproduction.
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