Tube Program Equalizer Chassis

what you get

  • true-to-the-original authentic chassis kits
  • made & engineered in Germany
  • Hammer finish powder coated back chassis
  • Original style hammer finish powder coated filter enclosures (2x)
  • Powder coated front panel
  • all cut outs for every single component:
    no cutting, drilling or filing
  • Wiring layout & Bill Of Materials
  • 3 bands of glory epaper on how this masterpiece works
  • the ultimate 42 page step by step build guide
  • adapter plates for the input & interstage transformer

Delivery time: 4-7 work days within Germany*

329.00  (391.51  incl. 19% VAT if applicable)

excl. 19% VAT

plus Shipping Costs


You know that moment when you hear a certain sound, instrument or piece of gear that leaves you with your mouth wide open. That was exactly my experience when I heard this wonderful passive tube equalizer for the very first time.
From that very moment I knew I had to have one for my studio!
What this thing can do to the high-end and low-end of your signal is simply mind blowing!

I designed this chassis kit following the original specs of a vintage unit and it not only includes all holes and cutouts for every single component needed, but also 2 filter enclosures to be mounted to the back of the main chassis. These boxes will house the passive filter units that are a vital part of that special sound character.

With this chassis kit, the included BOM and the wiring layout, you can re-create the holy grail of vintage tube equalizers for yourself!

!!! NEW: You also get the new epaper “3 bands of glory” where we dive deep into how this legendary EQ works !!!

!!! BRAND NEW: The long awaited “build guide” is ready – over 200 photos will show you the way !!!

PLEASE NOTE: The chassis kit is designed for the original Triad input & interstage transformer, so you could also go all vintage if you want to. In case you want to go with the replacements suggested in the BOM by Sowter, you need to use the two Sowter adapter plates (included). 


How it works in detail
(!warning – very nerdy stuff 😉

Complete bill of materials

extensive wiring layout

+ the ultimate step by step guide with no step skipped:

Additional information

Weight 3.3 kg
Dimensions 13.4 × 48.3 × 20.0 cm
available adapters

Sowter Input & Interstage Adapter plate (included)

required skill level

★★★✩✩ (simpler circuit than the Tube Opto Comp, wiring layout included but no step by step guide yet)

1 review for Tube Program Equalizer Chassis

  1. caderoberts777

    I have a pair of these eq’s built . Got them when they were first offered a year or so ago. Great quality. this was my second martinAnalog vibes build. Love them.

    Purchase not verified. Find out more

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