The EHX Electric Mistress Flanger

Published Categorized as Pedals 14 Comments on The EHX Electric Mistress Flanger

What the flanger?

Like the Electro Harmonix (EHX) Electric Mistress flangers in general use two identical signals and one is delayed slightly by an LFO (Low-Frequency Oscillator). These signals are mixed with the guitar signal so they cancel each other out at certain frequencies. The delay time decreases and increases up to 20ms what produces a swirling ‘jet’ like effect.
Back in the 60s and 70s bands like the Beatles used two tape machines to get a sound like that and recorded the results into a third one. E.g. you can hear that on ‘Lucy In The Sky With Diamonds’.

The History of the Electric Mistress

The Electric Mistress was developed by David Cockerell around 1975 and was the first flanger in a stompbox format. It was produced until 1985 with only small changes. It has a Rate, Range and Color knob and a switch to engage the Filter Matrix. It is driven by two 9v batteries or an 18v power supply.

The Filter Matrix

The filter matrix switch stops the LFO and therefore the oscillation. The cancellations then stay at the same frequency what produces metallic-like sounds. With sweeping the Range knob you can change the frequency.

Different Versions

With the very first V1 Electric mistress that had no Filter/Matrix switch, there are six different versions. The V2, V3, and V4 Electric Mistress are almost identical. On the V5 you only have to set the knobs a bit different but do get the same awesome sound.

Visit Ralf Metzger’s Electric Mistress Mystery Page for more detailed information on each version.

Electric Mistress V1


This is the only Electric Mistress that has a blueprinting and instead of the Filter/Matrix switch an On/Off switch. (PCB EH-5200-1-A)

Electric Mistress V2

1976 - 1978

The V2 is the only (green) version that has no scale printed around the knobs. (PCB EH-5200-1-A)

Electric Mistress V3

1978 - 1979

To find out if you have a V3, V4 or V5 Mistress you need to take a look at the Printed Circuit Board (PCB).
The V3 Version has hand-drawn circuit paths (either all tin or with mask) and has EH 5200-1A printed on the PCB.

Electric Mistress V4

1979 - 1980

The V4 (like some of the V3s) has a hand-drawn circuit paths and says EH 5200 1C on the PCB.

Electric Mistress V5

1980 - 1981

The V5 has straight circuit paths with constant thickness and the EH-5100-D PCB.

Electric Mistress V6

1981 - 1984

The V6 is the only version that has only one battery clip and works with 9V.

Where to put it

I tried the Electric Mistress with a lot of different pedals and amps. I recommend to put a flanger in the modulation section:

Where to put a flanger in the pedal chain

Electric Mistress Settings

Andy Summers Tone

To get Andy Summer’s tone with the Electric Mistress is quite easy. In fact, I have to think of Andy most of the time when using the Electric Mistress. Here is a setting that I use. Remember to turn up the Rate if you are using version 1-4.

David Gilmour Tone

Here is my David Gilmour setting on a V5 Mistress. On V1-V4 you will have to turn all knobs to 10 o’clock to get his sound.

Check out to learn more about David Gilmour’s tone.

Don’t forget to download the setting chart I made. Because whether you are in the studio or rehearsing for a live gig it is always useful to write down a setting that you like. So hopefully you will never sit in front of your Mistress and think ‘What was the setting of that sound again?’

Power Supply

Most of the vintage Electric Mistress pedals are being sold without a power supply. Unfortunately, the original power supply is no longer made and quite rare on the used market. Luckily I found an easy workaround that needs no modding at all:
Just buy an Electro Harmonix 18DC-500 EU (in Europe) or an Electro Harmonix US18DC-500 (in the US) and use a 3.5mm male to 5.5mm x 2.1mm female DC power adapter connector that keeps the tip-positive polarity!

Known Issues

Some people say they have a volume drop when using the pedal. Luckily I have none. But there is an easy non-invasive mod to solve that.
Also, there are rumors about the pedal being noisy. It is a vintage pedal so I guess it will never be as quiet as your digital flanger plugin. But I only noticed a quiet noise when not playing what is totally acceptable for a vintage pedal.

Trim Pots

Usually, you will never need to adjust the trim pots. But if you ever get a Mistress that sounds weird this might be the way to change that. If you open up the Mistress you can see two trim pots (small screws). The trim on the right is for the Delay IC. Move it to either side until the signal cuts out. Then set it in the middle of the two cutout points where the least distortion occurs. The pot on the left is for the Feedback. Turn it up and the pedal will oscillate (with the Color and Range set to max). Then turn it back until it stops oscillating.

Best Flanger out There?

I compared this pedal to a lot of different flangers (e.g. Moogerfooger MF-108, Boss HF-2, EHX Flanger Hoax, EHX Deluxe Electric Mistress, Ibanez FL9, …) and to me it is one of the best sounding flanger pedals out there.

Famous Users

Andy Summers (The Police)
Billy Corgan (The Smashing Pumpkins, Zwan)
David Gilmour (Pink Floyd)
Keith Levene (The Clash, Public Image Ltd)
Robert Smith (The Cure, Siouxsie & the Banshees, The Glove, Malice, The Easy Cure)
Robin Trower (Procol Harum, The Paramounts)
And more…


By Michael Miller

Hi there, I'm Michael (reamp labs), and I am a musician / media creative from Munich.


  1. Hi.

    I just bought a “1981” EH Electric Mistress v6 on ebay. The question I have is..The are no markings on the black circles around the rate,range and color knobs. This should be from ’76 ’till 79 or so I think.? The PCB board is clearly marked EH 5101 A. This I understand to be from 1981. The ad said it was an all original unodded EM. Did they make a 1981 version with no marks on the knob ring? Thanks if you can answer this. It’s really confusing to me.-Jim

    1. Hi Jim,
      congrats on your purchase and thanks for writing.
      Thats a good question. As far as I know your version should have the markings on the circles.
      But it could be that EHX had an old enclosure left that they used for your Mistress.
      Can you give me some more information like:
      · Is it a 9v or 18v (1 vs 2 battery clips) version?
      · Are the circuit paths hand drawn (with all / tin dots) or straight with constant thickness?
      · And can you get a look at the pot codes?
      I hope I can help you.
      All the best

      1. Thanks Mike for the quick reply.

        I will not recieve the Mistress until Friday, October 9th. I will give it a good inspection and let you know what I find. I really appreciate your help-Jim

  2. Hey, your section on power is WRONG. The US18DC-500 is a reverse-polarity barrel, i.e. center-positive. The extension you link to is also reverse-polarity, so that it can be used with standard-polarity barrel connections. Put the two together and you get a TIP NEGATIVE connector, which will fry an Electric Mistress. You need to remove that section before anyone either damages their pedal or gets killed.

    1. Hi Buzz,
      You are right! My guess is that the Godlyke cable is now a different one than back in 2015 when I wrote that post. Because I have one that does not reverse polarity. I just changed the section about the power supply.
      Thanks for your comment!

  3. Hi, I have just bought a EHX Mistress Flanger from Japan. Will this work in Canada with a EHX 24 volt 100ma adapter.

    1. Hi Michael,
      Congrats on your purchase! What version have you bought?
      The unit itself will definitely work in Canada since they are no country specific versions. Regarding the power adapter you have to check the signs on the unit itself carefully and choose a supply that fulfills the requirements.
      I hope this helps.

    1. Hi Mike,
      My best guess is that you need to adjust the internal ternal trim pots. Please hand it over to a professional for repair 🙂

  4. Hey bud, I was hoping you’d mention the most important part of the variations in models which is analog vs digital. I heard a bunch of old ones that sounded great and bought a new one and it sounded terrible only to find out the new ones are *gasp* dsp chips that have nothing to do with the old circuitry. Any way you can mention when they switched over the which are true analog like the original? That, to me, is MOST important. Thanks!

    1. Hi,
      this article is about the original Electric Mistress, built from 1976 to 1984. All of these pedals are analog. Next to the original Electric Mistress, there was a Deluxe version in a big box (1978 – 1981, reissued in 1999) that is analog.
      All newer pedals from 2006 are digital (XO and Nano-Series).
      Hope this helps,

  5. Hi there, I have a question about the Deluxe Electric Mistress Versions. My brother passed away almost 2 years ago. He was a musician but I am not. I have been selling his various pedals on eBay and always say that I do not know if they work, let alone how they work. I’ve sold a good number of his pedals and haven’t had any complaints or issues. I tried to sell this one and someone wrote to tell me I should just list it for parts if I don’t know if it works. I do not know the version and do not know if it works. I don’t have guitars & amps to try it. Wouldn’t know what I was doing anyway. Do you have a suggestion on how I can know if it works without the other equipment? It doesn’t have a light when plugged in. I saw up above the part about them getting fried so I am not sure on this one. Also, I do not have a box or manual, so how can I tell the version? It’s just plain black on back. I don’t see anything telling me the version on the outside. It does have a white power cord attached. I’m not having luck on eBay and will try to list with Reverb but I don’t want to sell a dud.

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