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My second Brelliott Modular TODP Tube OverDrive Pro has landed - this time it's the Blue Mutartis Cell Edition - with Pentode Mixer Module and Single Schottky Clipper applied

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2026-GPX-Brelliott-Twin-TODP-700.jpg

So in my previous TODP features - on the Main ’Tube’ Modules, and Clipper Boards, I detailed all the different options available and how I ended up with the Germanium Dual Clipper and Green Fetzer circuit on that version. Those were my favourite pairing. With the Blue Pentode Mixer Module + Single Schottky Clipper my very close second favourites. Those 2 pairs of boards seem to be perfect for each other - and perfectly balanced in output profile.

 

The Germanium clipping weirdly only works really well with the Fetzer Board - meaning that on my original Toxic Green Edition I almost exclusively love to pair the GE-D9A Dual Germanium Clipper with the stock Fetzer FET Tube emulation circuit module. The Fetzer FET Tube Emulation Circuit Board is the one that sounds the best across all the 6 different clipping editions - it has a really versatile core sound / timbre too. That pairing is kind of the all-rounder here!

 

My second favourite choice sees the Blue Pentode Mixer Module - which has a certain snap and punchiness to it - combined with the single Schottky Clipper. That delivers the perfect sort of Plexi tonality for me - you get the punch and the low end from the Pentode Mixer, and the Single Schottky Clipper is the perfect balance to that with a crisp and open clipping nature.

 

I generally use the Fetzer near enough the whole time - so I determined early on that I should have another unit for the 2 Pentode Module Options. The Purple Pentode board is a little more saturated and searing - a little more JCM800, while the Blue Pentode is rather more Plexi for me. The Fetzer is generally an all-rounder - and does Dumble style outputs really well. While the Blue Pentode has that added punch and low end - of a similar kind that you would get with an SLP amp.

 

The second TODP has been on the cards for quite a while - I initially thought I would pick one up last year - but now seems to be the perfect time! It’s really cool to have this colour-coded approach - so I instantly know which combinations I’m dealing with - these are my favourite pairings for sure. And I’m not about to be regularly chopping and changing the Onboard modules - where the Purple Pentode will occasionally come into play - while the green and blue are my definite favourites.

 

I would quite have liked to have had the 4 x  clipper boards colour-coded too - as not all of them are marked - and you sometimes need to examine each one under a magnifying glass to determine which is which. 3 of my now 5 have markings so it’s easy enough I suppose. I did all my in-depth testing in those first intensive rounds last year, and documented them well. I really like both artworks - they make for a really nice pair - while I will rarely have both varieties on the board - it’s normally one or the other.

 

The standard editions will always come with the Fetzer Module onboard alongside the Dual Schottky BAT85 Diodes [RoHS compatible]. So I stripped out my new one and replaced those boards with the Blue Pentode Mixer that I already had, alongside my existing Single Schottky BAT85 Diodes [RoHS compatible].

 

Refer to my previous 2 articles referenced above and in the related articles column - to establish how I decided upon my various switch and knob settings!

 

The core control topology is as follows :

 

Controls - Filter (LPF), REC (Recovery / Make-up Gain) : +6dB / 0 / +12dB, BST (Low Frequency Boost) : Bypass / 200Hz / 80Hz, LOAD (Load on Tube) : 47K (Hot) / 220K (Cold) / 100K (Medium), CUT (HPF) : Bypass / 200Hz, Level, Clipping / Distortion : Germanium / Silicon / LED / 2 x Anti-Blocking Diodes / 4 x Anti-Blocking Diodes / N (No Anti-Blocking Diodes).


Green Fetzer Module & Blue Pentode Mixer Modules and accompanying clippers

2026-GPX-Brelliott-Twin-Insides-TODP-700.jpg

As mentioned, you get the Fetzer Module as stock alongside the Dual Schottky BAT85 Diodes [RoHS compatible].

 

Both my setups are different to that - as I prefer the Dual Germanium D9A Diodes with the Fetzer board, and the Single Schottky BAT85 Diodes [RoHS compatible] with the Blue Pentode Mixer Board.

 

The available main 'Tube' Module options are :

  1. Green Fetzer FET Tube Emulation = overall the least saturated and most open-pored - but still very richly textured and poised. Delivers the best Clipping outputs across all 6 options - where all sound pretty much equally great, but especially the Germanium option - which is probably my favourite on the Fetzer and  significantly weaker for the 2 Pentodes [Included]
  2. Blue Soviet Miniature Rod Pentode / Mixer = slightly more open / less dense than the Purple one - with a distinctly punchy character and super quick and elastic response [£55]
  3. Purple Tube-V Soviet Miniature Rod Pentode / Power = Most dense and intense sound, and most 'charged' and saturated sounding [£65].

And I typically favour the first two - as mentioned.

 

For the Clipper Boards we have 4 options :

  1. Stock : Dual Schottky BAT85 Diodes [RoHS compatible] (Included)
  2. ALT 1 : Single Schottky BAT85 Diodes [RoHS compatible] (£10)
  3. ALT 2 : Dual Germanium D9A Diodes (£15)
  4. ALT 3 : Single Germanium D9L Diodes (£15)

Here I favour the Dual Germanium option for the Fetzer Module, and the Single Schottky for the Blue Pentode Mixer Module. As featured in the various visuals in this article - here follow a couple of visuals detailing those 7 Modul / Board options :

2025-GPX-Brelliott-TODP-Modules-V4-700.jpg
2025-GPX-Brelliott-TODP-Distortion-Modules-700.jpg

Dual and Single Germanium and Schottky Clipper Boards, Orange lines indicate Germanium types


The Insides and Outsides of my 2 favourite combinations - colour-coded by device!

2026-GPX-Brelliott-Twin-Toxic-TODP-700.jpg

My original Toxic Green Edition and Makeup

2026-GPX-Brelliott-Twin-Mutartis-TODP-700.jpg

My new Blue Mutartis Cell Edition and Makeup

 

Both the Stock Toxic Green Edition and Blue Mutartis Cell Edition come stock with Fetzer Module, and  Dual Schottky BAT85 Diodes Clipper [RoHS compliant]. The Stock model is available with or without Buffer - £245 / £259. The Mutarist version seems to come stock with Buffer, and is £259. Both are available on the Brelliott Webstore.

Those are exceptional prices for such a smart modular platform.

 

As I mentioned in my 2 earlier TODP articles - I would like for Johnny to add in Tone Stack Modules too - so besides the stock / fixed LPF onboard - would be cool to have one with Mids Sweep, and another with a Tilt-EQ for instance. I look forward to seeing that perfect in the next few years!

 

My suggestion would be to 4 do different One-Knob tone stacks, most likely the 4 following ones :

  • Hi-Cut Filter (currently stock)
  • Bandpass Filter / Mids Sweep / Contour
  • Big Muff Dark>Bright Tone Stack
  • Tilt EQ Tone Stack

4 Key Demos

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Stefan Karlsson
Posted by Stefan Karlsson
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