From Archived Sweetwater Page:

Seymour Duncan's SFX-03 Twin Tube Classic performs double-duty as a high-quality, 2-channel guitar preamp and stellar tube-driven overdrive. The Twin Tube Classic uses a duet of premium, mil-spec, subminiature, USA-made Phillips-Sylvania 6021 dual triode tubes, and generates a tone that's great for country, blues, surf, and classic rock. The key to the SFX-03's great sound is its ability to run high-plate voltage, allowing the tubes to really cook and create a thick, warm tone. Take your tone to new sonic heights with the SFX-03 Twin Tube Classic.

Seymour Duncan SFX-03 Twin Tube Classic at a Glance:

  • Sound
  • How it works

The 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 tone you expect from a high-quality tube preamp. Two channels provide sonic versatility, and true bypass maintains signal integrity when the pedal isn't engaged. A fully encapsulated toroidal transformer provides quiet operation, and the heavy duty steel chassis makes it rugged for the road.

How it works
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.

Seymour Duncan SFX-03 Twin Tube Classic Features:

  • 2-channel
  • Two USA-made Phillips-Sylvania 6021 dual triode tubes
  • High-plate voltage
  • External dimensions: 7.50" X 6.62" X 1.96"
  • Weight: 3.15 lbs.
  • Gain before level compensation: Rhythm channel - 74dB, Lead channel - 98dB
  • Gain after level compensation: Rhythm channel - 52dB, Lead channel - 76dB
  • Nominal output level: Rhythm channel - 0.4 Vrms (-5dBu), Lead channel - 0.5 Vrms (-4dBu)
  • Max. output level before clipping: 2 Vrms (+8dBu)
  • THD @ 1 Volt RMS output: 3%
  • Harmonic spectrum @ 1Vo: predominantly 2nd harmonic with minor amounts of 3rd harmonic @ > 20dB below.
  • Noise @ output: Rhythm channel - < 1mV (< 3 dB hum content), Lead channel - < 8mV (< 3 dB hum content)
  • Power consumption: 10.4 W

This pedal is in Very Good condition, showing signs of light-to-moderate use and careful storage. There are some light scratches/paint loss in the input jack area on the top of the unit. There are some light scratches on the sides of the unit. There is some residue from velcro on the bottom of the pedal. This package is complete with original box, original power supply, and original manual

This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.

Listed3 months ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.learn more
  • Twin Tube Classic

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Keith Holland Guitars

Los Gatos, CA, United States
Joined Reverb:2017

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