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Shift Line

SHIFT LINE Flex


The A+Flex is a tube bass preamplifier aimed at players who prefer the classic East Coast sound.

Here at Shift Line, we've always been particularly fascinated with bass-focused devices. Our product lineup includes the Olympic preamp with its "California sound", so the introduction of the East Coast-style Flex preamp was just a matter of time. We're extremely happy to introduce the new device, as the Flex can significantly expand your sound palette.

The A+ Flex is a fully analog preamp based on the 12AX7 tube. The device allows for soft compression and characterful harmonic saturation while also giving you control over your instrument's tonal balance and volume. The Flex has three outputs (main, balanced and THRU) allowing you to set up multiple independent signal chains. Additionally, you can use the device as a drive pedal or toneshaper due to its bypass switch.

Key Features

  • Fully fledged tube preamp with high-voltage power.
  • Fully analog signal path.
  • Wide-range input volume control.
  • Control over saturation character within tube stages.
  • Active EQ section with detents in neutral positions.
  • Harmonic saturation for any broadband signal.
  • Drive/toneshaper pedal capability.
  • Active tube DI Box with high-quality balanced output and Ground Lift function.
  • Small, lightweight and pedalboard-friendly aluminium enclosure with top-mounted jacks.

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