This is my review of the the Headache Sounds Electronics PBA1 Amplifier. This is a class D amplifier with a 12AY7 valve/tube on the inside. The PBA1 also features an effects loop, cab sim, headphones out and can power up to a 4ohm cabinet at 80 watts. My cabinet is 8ohm and is running at about 55watts. Tonally the PBA1 gives you lots of different options for anyone playing blues, classic rock, or even Jazz.