The Universal Audio UAFX Ruby 63 Top Boost Amplifier Pedal takes the quintessential British tubes tones and fires them out your amp. Its a style that took root back in the sixties and has been championed by countless artists since and now you can harness those hallowed howls with ease. Boasting powerful dual-engine processing and world-class UAD modelling the Ruby 63 produces crystal clear cleans classic overdrives and vexing vibratos.