Texas Star Dx 250 Make Texas Star Model DX 250 Catalog # EX 250 Description Class AB1 Amplifier with 4 power levels, power meter and preamp. Power Output 150W (4 watts drive)250W (20 watts drive) notes 2-2SC2290 Transistors Texas Star DX 250 Description Class AB1 Amplifier with 4 power levels, power meter and preamp.