Operating voltage: Recommended AC double AC18-26V Power more than 100WOutput peak: 100W + 100WOutput load: 4-8 ohm Potentiometer spacing:2.4cm IC Chip:A1633 C4278(Used ,not New,we 100% Tested good Quality) After the use of high-power output tube drive, with a variety of speakers, the output power, the latest PCB software design, to ensure stable circuit and improve signal to noise ratio. Application of digital delay reverberation, and with tone control, user-friendly installation. b80_conew1b81_conew1b82_conew2b83_conew1b84_conew1b85_conew1b86_conew1b87