Please click here for detailed specifics regarding our specialized packing process that separates us from the rest. Now when SF say The goal was to build the. Some preamps will then move into the listening room where they will be tested with our in-house reference system. Enter the Sonic Frontiers SFL-2 - a no-holds-bared preamp at an unbelievable price for what you get of 1200 (used). Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.Īt this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.įinal testing involves putting actual music through the preamplifier We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Special attention is paid to the power supply which is the most common source of failure for preamps. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. The SkyFi Testing Process for Preamplifiers: The SFL-1 was again inspired by a Joe Curcio design. Vacuum-tube line preamplifier with fully differential, all-balanced circuitry, outboard power supply, and remote control of all functions with 0.5dB steps of volume and balance. However, it was their SFL-1 preamplifier that put them on the map. Sonic Frontiers SFL-2 Preamplifier Manual Check out the Amplitrex in action via our YouTube channel. Just cleaned and serviced by our technical staff.Īll tubes tested with our modern and professional vacuum tube tester, the Amplitrex AT-1000. "Last but not least, and most important, crucial even, the volume attenuator is a 46-position fixed resistance array - only the best so the SFL-2 could be that good."īuilt like a tank and designed for quiet operation mostly due to the power supply being housed on a completely separate chassis.įeatures a great compliment of XLR and RCA inputs/outputs. Plus you know it's something special when it's Stereophile Class A Rated *AND* featured on the fantastic vintage HiFi website The Vintage Knob!! Sounding wonderful with typical tube warmth and resolution. Gorgeous dual-chassis all tube preamp from Sonic Frontiers.
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