SEYMOUR DUNCAN SFX-03
Owner's Manual

Detailed Step-By-Step Instructions
1. Plug in the cable of the provided 16 VAC power supply to the distortion box then plug the �wall wart� end into a 120V wall outlet or power strip (or voltage applicable for your country). You should see the green LED on the Rhythm channel light up. All other status indicators will be dark. When �rst powered up, the Twin Tube Classic will always default to bypassed mode with the Rhythm channel staged in waiting mode. 2. Turn both Master Volumes fully down (counter-clockwise). Set the Bass and Treble controls at 12 oʼclock. 3. Connect a good quality, shielded ¼� cable from the output jack to the input of your ampli�er. 4. Connect another good quality, shielded ¼� cable, �rst to the output jack on your guitar, and then to the input jack of the Twin Tube Classic. Note that the tubes in the Twin Tube Classic may require two to three minutes to warm up and begin to produce sound. 5. Press the �On/Bypass� button to activate the Rhythm Channel. Turn the Gain control up about half way. Slowly turn the Master Volume up as you pluck a string. Fine-tune the Gain setting to achieve the level of overdrive and saturation you want. Set the Master to achieve the playing volume you want. 6. Press the �Channel Select� button to switch to the Lead Channel. Repeat the previous process of setting up the Gain and Master Volumes. 7. Adjust the Bass and Treble controls as desired. Note that they in�uence both channels. We have �pre-voiced� the two channels to provide what we feel is a balanced tone when switching from Lead Channel to Rhythm Channel and to facilitate using one common set of tone controls. 8. Balance your wet to dry levels by working with the Volume control(s) on your amp and the Master Volumes on the distortion box. 9. Never open the chassis. There are no user serviceable parts inside and tampering with the high voltage tube circuits could result in serious injury or death � not to mention damage to the unit.

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