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(SOLD OUT: New batch in late July/Aug) Project 941 Modulator : Bulb-driven Vibe

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Project 941 Modulator: Bulb-driven Vibe
Acid-etched "Sea-Worn" finish

**Pedals will ship on or about Monday 05/22
Each pedal in the Cold War series is hand built, one at a time, in the Wrought Iron Shop by me, Ed Chew. The graphics are acid-etched, then powdercoated, sanded and polished in an 8 step process, then finally waxed with ceramic wax and buffed to a shine.  Because of variations in etching and sanding, each one will be unique in appearance with some light "weathering" around the edges.  Each one carries some history with it, in its components and name.


    The Project 941 Modulator, the 3rd release in the Cold War Series, is an incandescent bulb-driven Vibe with roots in an old tube driven Hammond organ vibrato circuit and the original Uni-Vibe. It is a 4 stage, phase shifting vibrato, with parallel dry signal for that classic "chorus" Vibe sound.  It uses 11 NOS Soviet transistors and features a Soviet panel meter to indicate rate.
The 941 is named after the largest class of submarine ever built: the Soviet Project 941, or Akula (Shark) Class, ballistic missile submarine built in the 70s and 80s.

    My goal in designing this pedal had 5 main parts:
1. Design a Vibe that could be used as an "always-on" modulation, giving movement and dimension to your guitar tone without overpowering it. I wanted the majority of the controls to sit in that area, but still have the ability to do out front Vibe sounds, too.

2. Create a signal path with NOS Soviet silicon transistors

3. Design a unique analog LFO to drive the bulb that could go both really slow, AND fast enough to create a legit vibrato sound (about 7 hz).  This is where I feel that a lot of Vibes suffer- they don't quite go fast enough to get into good Vibrato territory.  I also wanted the LFO to drive a vintage Soviet panel meter to indicate the rate.

4. Design a unique final amplification stage, so that the pedal could be used clean, but also included its own post-vibe overdrive sound, using the same NOS Soviet transistors.

5. Create feedback paths that could be switched on to give the Vibe different modes, for the times when you really want it to stand out, or even to sound crazy

  Because this was the biggest design challenge I had ever undertaken, I thought it needed to be named after a Cold War project that was a huge undertaking for the engineers of the time. Thus I chose the Project 941 submarine.  Like the 2 previous entries in the Cold War series, I tried to make the aesthetic reminiscent of a control panel in the submarine (or rocket, as in the N-1).  

I believe I have met each of the goals I set out to achieve in the Project 941 Modulator. Whether you want an always-on, subtle vibrato/vibe sound, or an over the top pulsating modulation, or to switch between both with the stomp of a switch, the 941 can do it. I hope you find that it works well for you in your rig!


Gain: controls the gain of the final transistor stage. All the way CCW is unity gain, crank it up to add some chewy overdrive.

Ratio: This unique control lets you determine how much of the wet signal you want to add into the mix of wet and dry. If you want a deep pulse, but want to tame it down so it is not over-powering, this control lets you do that.

Depth: this controls how bright the bulb flashes, which dictates how much phasing/pulsing/vibrato there is.

Rate: how fast the LFO cycles

Heave: adds in a low frequency feedback path to make the effect deeper and gives a little more "throb".

Dry Cut: move this switch up if you want just the wet signal. This is analogous to the "vibrato" mode of a traditional Uni-Vibe.

Fast/Slow: select from 2 different speed ranges for the Rate Control

Dive: this switch adds in another feedback path, this one more focused in the mid range. Used together with the Heave control, you can get really over-the-top pulsating sounds.



Always-on rate indicator (diffused yellow LED and panel meter)
Laser cut illuminated Soviet Quality mark "Active" indicator
Acid etched and polished raised graphics.
Custom aluminum plate enclosure, folded in the Wrought Iron shop
DeMont premium smooth-click activation switch
Taiway "Dive" switch and toggles
Switchcraft audio Jacks
100,000 hr rated incandescent bulb
USA made circuit board with through-hole components
Alpha potentiometers
AlcoSwitch dial knobs
Stamped serial number in bottom plate


1 Review Hide Reviews Show Reviews

  • 5
    Best. Vibe. Ever. Plus much more.

    Posted by Ed Pettersen on Jun 3rd 2023

    Okay, anyone who knows me knows I know and love my effects. I have tried virtually every vibe pedal known to man (seriously) and while a few have tickled my fancy none have really captured my imagination until now. The 941 is ridiculously deep. It can be your always on, subtle vibe (which is what I do) but it has grit built in which is beautiful and adds to your always on color in a productive way. However, it can also do crazy stuff (Yay! Also my thing) and this is easy to navigate via some thoughtful design choices like the switches and dive switch. I originally intended to use this mainly for the studio and not my live rig because, well, it's large and I was afraid it wouldn't be easily replaceable on the road but the functionality, sound and features make it too indispensable to leave at home. Simply put, it's never leaving my main board and it's always going with me. Try it. I bet you'll feel the same. It just completely blew me away. Best money I've spent in a while.

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