Music Thing Modular Spring Reverb Mkii – Full DIY Kit

From: £85.00 (Excl. VAT)

You can use both a Spring Tank and a Digital Brick with one Spring Reverb Module, to use a Tank and Brick at the same time you’ll need the Spring Reverb Expander

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Out of Stock


The Belton/Accutronics Tank and Brick are sometimes available as an extra option to buy from us, discussion of Brick and Tank suppliers here.

This is a full kit that includes everything you need to build a 6hp Eurorack module, you just need to provide the spring tank or digital brick. The Music Thing Spring Reverb Mkii is a flexible, easy-to-build voltage controlled DIY mono spring reverb module. Traditional guitar reverbs are tuned to the sound of the guitar and the amplifier it is played through. This circuit is different; designed to be relatively clean and high-fi, with a lot of bass response. Use real spring reverb tanks, or solid state reverb bricks.

New Features of the Spring Reverb Mkii include:

  • Internal Feedback control with CV input, dedicated attenuverter and with invert switch for maximum feedbackiness
  • Wet out and feedback in sockets for more flexible patching
  • 3HP Expander – allows for instant switching between reverb brick and spring tank – or set a blend between the two
  • Expander also allows for front panel send and return to spring tank.
  • New improved circuit

Buy the Expander here –

Thonk Build Document –

Music Thing documentation here –

More Features

  • Works with a variety of spring reverb tanks (optional), or with the Accutronics BTDR-2 reverb ‘brick’ designed by Brian Neunaber (optional)
  • VactroI (VTL5C3) crossfade between dry and wet (vactroI circuits are variable in their ability to go completely 100% wet, like the Make Noise Echophon for example)
  • Tilt EQ on the reverb send to tune the voice of the reverb
  • X-Fade input so the module can also be used as a standalone vactroI crossfader (crossfade demo)
  • Feedback circuit with positive and negative phase
  • Attenuverter on the crossfade CV input
  • 6hp wide (NB: If using the brick, mounted horizontally, the brick extends 5mm over the PCB to the left of the module, around 25mm back from the front panel, so mount the reverb next to a shallow module)
  • Expander with Front panel mount Phono sockets & Crossfade between reverb types.

Additional information

HP Size

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Weight N/A
Panel Type

Aluminium Frontpanel, Black Aluminium Frontpanel

HP Size