Seymour Duncan SFX-03 manual Specifications, Gain, Nominal output level, Noise @ output

Specifications

Description – The SFX-03 is a two-channel guitar preamp employing premium subminiature type 6021 vacuum tubes. The 6021 is manufactured to meet the stringent MIL-E-1 specification for reliability and is optimized to provide long service life under conditions of severe shock, vibration, high temperature, and high altitude. The tubes are configured with a high-voltage power supply for maximum dynamic range. True-bypass capabilities are provided to allow uncolored feed- through.

Gain

•Before level compensation Rhythm channel – 74dB Lead channel – 98dB

•After level compensation Rhythm channel – 52dB Lead channel – 76dB

(Gain measured at 500Hz).

Nominal output level

•Rhythm channel – 0.4 Vrms (-5dBu) •Lead channel – 0.5 Vrms (-4dBu)

(Nom. output level measured with 100mV 500Hz input signal and all controls set to 12 oʼclock).

Max. output level before clipping – 2 Vrms (+8dBu) (Max. output measured with all controls set fully up).

THD @ 1 Volt RMS output – 3%

Harmonic spectrum @ 1Vo – predominantly 2nd harmonic with minor amounts of 3rd harmonic @ > 20dB below.

Noise @ output

•Rhythm channel - < 3 mV (< 3 dB hum content) •Lead channel - < 10 mV (< 3 dB hum content)

(Noise measured with all controls set fully up and input shorted).

Power consumption – 10.4 W

External dimensions – 7.50 X 6.62 X 1.96 in. (190 X 168 X 50 mm)

Weight – 3.15 lbs. (1.43KG)

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