Flex A+

The A+ Flex by Shift Line is a tube bass preamplifier designed for musicians seeking a classic East Coast sound. This fully analog device utilizes a 12AX7 tube to provide warm, rich tones ideal for bass players. Musically, the Flex offers soft compression and harmonic saturation, enhancing your instrument's character while allowing for precise control over tonal balance and volume. With three outputs—main, balanced, and THRU—you can configure multiple independent signal chains. The bypass switch adds versatility, enabling the Flex to function as a drive pedal or tonal shaper, expanding your sound options effectively.