That's correct, I actually got the details on how to build one from a thread in the Freestompboxes.org forum that was started by a member called Darkrain, the circuit of the GTFO is basically a clone of the Soldano GTO Supercharger, it uses two 12AX7 Twin Triode Valves which are run at about 350V DC so that you get a very high gain Soldano SLO100 kind of sound, a friend of mine is borrowing it so he can use it in his stage rig.







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