Fender's '57 Custom Pro-Amp is a reimagining of the tweed Pro Amp designed to recreate the classic Fender tone. The sonically flexible amplifier is built around a vintage all-tube circuit for richer clarity and creamy overdrive when turned up. The original 5E5A circuit powering the '57 Custom Pro-Amp is well-known for tonal flexibility, and the addition of a presence control adds adjustable upper harmonic overdrive to dial in just the right amount of ’sizzle’ to your sound.