The Sonic Frontiers SFC-1 is a brilliant and highly acclaimed valve line stage integrated amplifier.
From a time when "affordable tube amp" didn't necessarily outline a chinese provenance, the SFC-1 was Sonic Frontiers answer and designed like all of SF's production by Joe Curcio.
The absence of a phono input made for most of the savings but the rest was built like its separates and with the same kind of "ultra" parts : Tiffany i/o plugs, Edison-Price speaker terminals, Cardas wiring, ALPS pots, Holco, Wima, Vishay, Solen caps & resistors.
The three transformers are grain-oriented silicon steel home-made designs, with the output two having a fixed 6 Ohm tap ; polypropylene shunt caps, right-angle and "en l'air" wiring finish the seriously hand-made picture.
The preamp part is based on regulated 12AU7A and 12AT7A triodes direct coupled to a differential phase splitter/driver stage ; output tubes are two mil-spec and matched EL34L.
The feedback loop is kept at a low 11dB level and screen and bias supplies are regulated as well, of course, naturally.
One input source can be privileged by being plugged into Direct terminals; this Direct input bypasses all front-panel functions and selectors except muting and volume.
The back-plate has a meter and two pots for checking/biasing the tubes with two max. readings : "40" for the pre-installed tubes (and longest lifetime) and "50" if swapping the latter for 6550, KT88, KT90 or KT90a tubes.
- Power 100 watts/channel (peak power): 50 watts RMS at I kHz (40 ma. bias, I channel driven)
- Frequency Response: 4 Hz to 50 kHz + 3.0 dB (1 watt)
- Input Impedance: 40 Kohms (Normal) 80 Kohms (Direct)
- Input Sensitivity: .40V RMS at 1 kHz for 45 watts
- Tube Complement: 2 MP - EL34/E34L 1 - 12AT7A 2 - 12AU7A
- Dimensions 19 in. Wide x 17 in. Deep x 7.5 in. High
- Net Weight 60 lbs.
Wonderful music is made by the SFC-1. You won't find anything even close to the build quality and performance for under $1000!
This model did not come stock with handles. The original owner ordered the handles custom from SF when he purchased it!
Well...I better raise the price!
An operating manual for the SFC-1 and power cord is included. This model did not offer remote control.
The unit is in excellent sonic and cosmetic condition as can be seen from the listing photographs.