MTM Spring Reverb (Full DIY Kit) Eurorack

149.-

03.08.2026

3414, Oberburg

This is a full DIY kit for the MTM Spring Reverb main module, except the spring tank or digital brick. The Music Thing Spring Reverb mk2 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 hi-fi, with a lot of bass response. Use real spring reverb tanks, or solid state reverb bricks.

New Features of the Spring Reverb mk2 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

More Features:
Works with a variety of spring reverb tanks (optional), or with the Accutronics BTDR-2 reverb brick designed by Brian Neunaber (optional)
Vactrol (VTL5C3) crossfade between dry and wet (vactrol 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 vactrol 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.

Instead of the reverb tanks you can use a digital brick, which you can find at Banzai Music

Features:
We provide genuine Accutronics/Belton Spring Reverb Tanks separately, have a look in our shop. They produce high quality and springy responses!

Medium 8EB2C1B Springs: 3, Delay Type: Medium, Tank Dimensions: 23.5 x 8.5 x 3.3cm, Input Impedance: 800 Ohms, Output Impedance: 2575 Ohms, Mounting: Horizontal Open Side Down, Connectors: Input Insulated Output Grounded

Large 9EB2C1B Springs: 3, Delay Type: Medium, Tank Dimensions: 42.5 x 12 x 3.3cm, Input Impedance: 800 Ohms, Output Impedance: 2575 Ohms, Mounting: Horizontal Open Side Down,

DIY-Kit-Type:
THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. go to our site

+12V. 75mA
-12V. 25mA
6HP
2mm Black Aluminium Panel
Knobs: Black Aluminium Style