The OR15H model incorporates the latest Tiny Terror engine in the latest Tiny Terror, in 1972, the powerful guitar amplifier "OR50H" that has brought orange sound to the world. The preamp is only one channel, and the control is super simple with input gain and volume and tone only. However, the sound is a compact full tube of 15 watts of class "A" and the sound is "orange when it comes to the light!! It is tuned so great that it can be sayed.