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All Tube Power Unleashed

Brainworx and Plugin Alliance are thrilled to present the native plugin version of AMPEG’s seminal V–4B 100W All-Tube Bass Amp.

The original amp came on the market back in 1971 and featured the same preamp as the Ampeg SVT, but introduced a 100 watt power amp, all tube construction and matching 1x12, 2x12, and 8x10 cabinets. To put it simply, the V–4B is an amazing reissue of the well-known 1971 original and delivers a thick tube tone with an uncompromising low end that has made its way into countless bass rigs over the years. It can be heard on countless hits!

With the V–4B it’s easy to plug in and quickly get a huge round tone that has made AMPEG the go-to standard for bass players the world over. The controls on the V–4B are simple and to the point, featuring a 3 band EQ with switchable mids and ultra low and high switches for defining power and note definition. This remarkable simplicity allows you to quickly dial in a vast range of tones, everything from boomy and beefy down to something more honky and gritty.

With the AMPEG V-4B plugin you get an exacting emulation of the original hardware amp. In the digital version of the amp you also get access to 65 Recording Chains that feature well engineered combinations of classic microphones and a ton of boutique outboard gear all running through a Neve VXS72 console. Brainworx’s FX Rack also offers onboard effects such as a noise gate, filter control and a horn on/off function for the cabinets.


  • Exacting emulation of the original Ampeg V-4B All Tube Bass Amp, endorsed by Ampeg
  • Pure AMPEG tube tone
  • 65 Brainworx-made Recording Chains
  • FX Rack include noise gate, tight and smooth filters, Power Soak and a horn On/Off function for the cabinets
  • 3-Band EQ with switchable mid frequency for powerful tone shaping
  • Ultra-Low and Ultra-High controls

Audio Examples

Industry Reviews

  • Audio Militia Studios

    Audio Militia Studios

    The legendary sound of Ampeg, always ready to go no matter where you are.

    The effects rack opens up so many more possibilities that you can’t get with the actual amp.

  • Philipp Wilhelm

    Philipp Wilhelm

    Musician, Bass player, Producing Student

    The amp has been recorded perfectly without any room or microphone issues. That’s something I could never do in my workspace.

Customer Reviews

  • A peg Love

    by Chris
    Long time ampeg user. Love this.
  • The O.G

    by Audiomilitia
    Stood the test of time because it really is THAT GOOD ! , Just plug in and get lost in Superb Tone , definitely one of my "Go To's " for killer bass tone .
  • What a beast

    by Frode Obelix Martinsen
    Who doesent love Ampeg on bass, im never gonna mike a bass amp ever again. Easy to use straight out of the box. I have used the real thing in studio and i must say these amps are insane good. So… Read More
  • AMPEG Power and Tone in the Box!

    by Black Frost
    I am a recording bass player, currently moving from just demoing songs and ideas to actually record songs that will eventually be published, and this beast got me sold on the first hit of a… Read More


Supported Plugin Formats
AAX DSP, AAX Native, AU, AAX AudioSuite, VST2, VST3

Supported Operating Systems
macOS 10.9 through 10.15
Windows 7 through 10

Intel CPU only (minimum 2 GHz recommended)

x64-compatible CPU

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM


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Ampeg V-4B - Changelog

Version 1.2 (May 27, 2020)
- General: Qualified for use with the Windows 10 May 2020 Update
- General: VST3: Fixed potential hangs in a DAW upon loading
- General: Fixed logical issues in undo / redo behavior
- General: Fixed UI resizing issues in Ableton Live on Windows
- General: Fixed audio processing initialization issues on amp and delay products

Version 1.1 (Nov 06, 2019)
- General: Qualified for use with macOS 10.15 Catalina
- General: Qualified for use with Windows 10 November 2019 Update
- General: Fixed plugin validation in Logic under macOS Catalina
- General: Fixed preset name restore in Logic when reopening a session
- General: Fixed opening authorization dialog triggering automation
- General: Improved instantiation times for plugins
- General: Improved license functionality and branding for subscription
- General: Removed 32-bit support on macOS and Windows

Version 1.0 (July 8, 2019)