The original amp had two inputs, one „normal“ input and one „FET“ input. The normal input goes straight to the first tube gain stage. The FET input goes through a small „Field Effect Transistor“ gain stage similar to a clean boost before hitting the first tube gain stage. This input works very well with the SSS amps if you want some extra overdrive from the preamp. The oringinal had the „volume“ control for the FET input inside the amp, so it could not be adjusted on the fly. As an option we offer the FET control on a push-pull switch just above the input, and the FET volume/gain can be adjusted with this knob. It can also be switched on and off via a footswitch.
The Secret Weapon of the SSS amps are the High and Low step fliters, which can be used to dial a wide range of tones. Each filter has six settings. They work in conjunction with the normal tone controls to create a very broad pallete of sonic options. The Bass Filter is very useful for taming a boomy speaker cabinet or room, or adding a big fat low end to a Stratocaster. Once you set the step filter you can fine tune the low end with the standard Bass tone control. With the High filter you can go from mild to wild glassy top end on your tone, and again fine tune the color with the treble and mid tone controls. If you can hear it in your head, there’s a good change you can dial the Texas Flood to deliver it.
The reverb send knob is on the back to save a little extra space on the front panel. The reverb send gain is typically used to keep from overdriving the spring reverb tank and causing it to be too flubby or boingy. Once you have the reverb effect sounding the way you want with the send contol, then the front panel reverb return control can be used to set the overall reverb level. It is a very versitile and natural sounding implementation, as good as any studio reverb unit out there and a big improvement over the standard Fender Twin circuit used in almost every other amp. The amp has passive FX loop with the Send and Return jacks on the back.