Paul Reed Smith Dallas 50 4X10 Derek Trucks Mod Guitar Combo AmpNotes Loaded with 4 Celestion Greenback G10 speakers The Dallas amp was influenced by the great vintage American amps. It is a throwback style amp that remains very versatile. In the Derek Trucks mod, the gain was increased and the tone stack values were adjusted more towards a blackface Super Reverb. A Paul Reed Smith Dallas 50 4X10 Derek Trucks Mod Guitar Combo Amp in Excellent condition! At Evolution Music, we attempt to highlight cosmetic defects