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Unlike its Twin Tube brethren, the SFX-11 features a duet of premium, subminiature, USA-made Phillips-Sylvania® 6111 dual triode tubes. These tubes are voiced similar to a familiar 12AU7 and represent the pinnacle of tube technology. They were designed and manufactured to meet the U.S. Government’s MIL-E-1 spec for reliability under conditions of severe shock, vibration, and temperature. They provide extremely long service life and exhibit virtually no tendency toward microphonics.
Speaking of tubes, too often, inexpensive tube gear runs in “starved plate mode,” where the tubes function like clipping diodes and do not actually amplify. The Twin Tube Blue’s high-plate voltage and 100% vacuum tube signal path allows the tubes to operate at their fullest potential and provide maximum dynamic range. The means you get the most gain and all the smooth, bluesy tone you expect from a high-quality tube preamp.