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4. Using the Tube Fex in the effects loop of a separate preamp.In this case, the Tube Fex is used as an outboard effects processor of your preamplifier. To hook up:$50 Connect your guitar to your preamp’s input.b Connect the preamp’s Effects Loop send to the Signal Input jack on the Tube Fex.b Connect the Left/Mono and Right Unbalanced Outputs to the Left and Right Loop Return of yourpreamp, respectively.h Connect the Left and Right Outputs of your preamp to your amplifier’s audio inputsfi If you haven’t already done so, connect the Left and Right Outputs of the amplifier to speakers.Note: For mono operation use only the Left/Mono jacks in the steps above.To Signal Input of preampTube FexTo Loop ReturnFrom Loop SendFrom Audio OutputClassice Series 50150 1 .Classic’ 410E74 Chapter 7 Setup