PRS HDRX 50 Watt Head Guitar AmpDesigned to push the high end so it is very clear, but not so much that it's harsh, the PRS HDRX shines without glaring and allows for aggression that can be backed off for smooth, sweet tones. The PRS HDRX 50 is driven by a pair of EL34EH power tubes, the best pre amp tubes available, and a custom designed Straight Edge output transformer. The HDRX 50 has the documented 100 watt power supply, which makes it sound much closer to the 100 watt amplifier