Electro-Harmonix Holy Grail
Electro-Harmonix Holy Grail

Holy Grail, Reverb for Guitar from Electro-Harmonix in the Holy Grail series.

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All user reviews for the Electro-Harmonix Holy Grail

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Average Score:4.3( 4.3/5 based on 22 reviews )
 12 reviews55 %
 7 reviews32 %
 1 user review5 %
 1 user review5 %
 1 user review5 %
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iamqman's review"How do you like it"

Electro-Harmonix Holy Grail
Electro harmonics is one of those companies that buillds some of the best effects pedals in the world. The most common and highly recognizable pedal that they may have has to be a big muff distortion. They do create a lot of cool delay pedals and effects pedals and this is one of them. This is the holy Grail reverb pedal which comes in a pretty decent size box and has only one knob of operation. It doesn't have a small little control on the west side of the changes in the modes but there's not a whole lot of figuring out with this unit.


You basically have one control knob that turns the reverb effect the loudest it can go. There is a mode switch that changes the setting of the unit if you want a different voicing. it has a input and an output and that is about it as far as features go.


The sound of this pedal is a nice sounding reverb tone that will sound good in pretty much any amplifier for guitar rig is a classic vintage style pedal that doesn't have any new or modern features that you see on many newer pedals today. So it doesn't have any USB or midi capabilities but what it does is give you a classical old reverb style that has a single control knob to give you a nice sounding room filling tone.


I'm not sure if Electra harmonics is making these pedals anymore because they really have been pushing their newer digital reverb pedal that comes in a compact small nano box. If you're looking for a newer pedal then I'll probably go with that one but if you're an old-school type of person then you want the vintage electro-harmonics style then this would be the only way to go.

wwhhhaatt's review"good when you get a good one"

Electro-Harmonix Holy Grail
This is just a plain and simple reverb pedal.
1/4" input and output
9v power jack
one stomp switch
one knob
one switch to change between spring, hall, and flerb settings


Getting a great sound out of the holy grail is very simple. In typical old school EH style you get a simple layout that's meant to just get good sound. No frills. Plug in your cables, get some power to it, twiddle the knobs and you are good to go. I suggest using the supplied adapter since this pedal takes quite a bit of juice to run properly.


The sound of this reverb is excellent and very natural sounding. It is not thin and over processed sounding like some of the others out there and does not muffle or bury your sound unless you want it to. I have never owned a nice spring reverb but this emulation seems to work for people who have owned them. All I know is that it sounds better that my experience with cheaper spring reverb units. The hall sound is what I mainly used because it seems a bit deeper sounding and works better for that huge ambient sound that I like in a reverb. It fills out the sound nicely without that digital sound you get in the boss stomps or other digital emulations. The flerb sound is nice to have too for when you want something a little more wild sounding although it would be hard to work it into a lot of songs because it stands out quite a bit. I think they were going for a flange sound hence the "FL"erb whatever it is I like it and it's very unique.

Another welcome thing is the bypass. No preamps or buffers in this pedal just a nice big true bypass stomp switch. I am not of the crowd that thinks your whole signal chain should be true bypass but I definitely prefer time based effects that might be in your amp's effects loop to be either true bypass or have a very high quality buffer. Electro Harmonix is not exactly known for quality buffers so I think it was a good call going for a true bypass on this box.


For me the sound of a pedal is always the number one priority. I can usually work around any design hangups if the end sound is worth it. I would say the Holy grail is great for most reverb requirements. It is not very tweakable but the one knob design provides a pretty wide variety of tones. The knob is also big enough to move with your foot during live performances. That is something I love about the huge boxes Electro harmonix likes to use.

The one downside to this pedal is there seems to be a bit of quality control problem and an intermittent noise issue. I have owned three of these and one had a high pitch whining that was always there while the others it was intermittent or not there at all. The pedal also seems to be picky about power supplies and placement. I had mixed results using a pedal power II so I usually just used the supplied wall wart and never ran any boosts/od/etc.. after it.

If you get one that does not have noise issues you will love the sound.

mooseherman's review

Electro-Harmonix Holy Grail
This is a unique analog reverb pedal. It can't be edited through a PC or Mac, and is not controllable by MIDI. It isn't rackable, as it is a guitar pedal. It has a 1/4" input and a 1/4" output, and can be powered with a power supply that comes with it, as well as with a battery.


The editing on this box couldn't be easier. It has one knob and a switch with three modes. The different modes are spring reverb, which is similar (almost identical) to the reverb found in old-school guitar amps. The next setting, hall, is pretty obvious. It sounds like you are playing in a room with lots of natural reverb. The third setting is called "flurb" and it stands for a mixture of flanger and reverb, which is a good way of describing the effect.


I use this primarily with my Strat and Twin combo, since I use that most. I've tried it with an SG as well, and I liked that too. In general, this pedal will probably work the same with most guitars, and will possibly work well with other instruments like bass, keys, and vocals too. The quality of the sound is pretty awesome. It doesn't color the sound too hard from what was originally plugged it. It's generally pretty transparent. I thought that only having the one knob would be kind of limiting, as there isn't a whole lot of control to be found, but I actually kind of liked it after awhile. The fact is, the pedal is only capable of producing GREAT tones. It just depends on how much reverb you want there to be. I think that the spring and hall settings are way better than the "flurb" setting, but that's mainly because I am not a huge fan of the flanger effect in general. That being said, the spring setting is almost exactly like the reverb on my twin amp, except possibly clearer. I was quite a fan of it, really. The hall reverb is also quite natural. I like the sound of really reverberant rooms in general, but it's not always possible to record parts in rooms like that. This is when pedals like this come in handy. It seems like each value on the knob is like a different tone, good for almost every purpose.


The only thing I disliked about this pedal was the "flurb" setting. I had no use for it. Otherwise, it sounded great. Even though its marketed as being great for recording, I don't know if this is necessarily true, as the reverb does not have many ways to affect the sound. It might be difficult to manage within the context of recording a song. I think that this is a perfect pedal if you want reverb on your guitar during a live show. It might work with vocals for live shows, as well. I think that this is a great pedal, which isn't surprising since this company has always made great pedals.

moosers's review

Electro-Harmonix Holy Grail
The Electro Harmonix Holy Grail is an analog reverb pedal. It has a 1/4 inch input and output and is not a rackable unit - it is a stompc box.


The configuration of the pedal couldn't be easier. It has a switch to choose which type of reverb you want - either spring, hall or flerb and has a large knob to control the level of the reveb. It is extremely easy to get a good reverb sound from this. I don't have a manual for this but this might be the easiest pedal in the world to use, so you probably don't need it.


The reverb produced with the Electro Harmonix Holy Grail reverb is great. Even though the parameters are limited, the three different types of reverbs make it vesatile because they are each unique sounding from each other. The spring and hall reverbs are both rich and are your typical spring and hall reverb effects. The flerb, on the other hand, is unique from just about any other reverb sound, as it brings its own sound to the table. I have used this pedal only with guitar - usually a '76 Fender Twin Reverb and a Gibson SG.


I've been using the Electro Harmonix Holy Grail for about three years. I love it because of the high sound quality and the ease of use. I don't have to fiddle for hours with this to get a good sound - it is quick and easy to dial in a great reverb tone. While this isn't as versatile as a Boss RV-5 or a Line 6 Verbzilla, you'll save a bit of money if you are looking for some simple, but realistic reverb sounds. The price is cheap and you know you're getting a good product because of Electo Harmonix's great reputation. Overall, I definitley recommend guitars who need some reverb to look into the Holy Grail.

MGR/Erik's review"Electro-Harmonix Holy Grail Reverb"

Electro-Harmonix Holy Grail
I paid roughly 100 USD from a guy who'd sold his amp and didn't need it anymore.

It is very easy to use. In addition to that, the design of the unit is very nice and makes you wanna try it out. But of course the best thing about it is the "Reverb" and the "Flerb" effect which is a mix of flanger and reverb that you can get out of it.

The only thing that made me a bit reluctant at the prospect of buying it was the fact that the unit only works with an adapter and no batteries which I think is a shame but the quality of the effect makes you forget about that quite quickly.

The pedal is very light in itself so it is hard to say whether it could withstand a truck driving over it. However, apart from that the construction looks reliable.

Great effect sound. I've been trying out and buying a few reverb pedals before I bought this one and kept always returning them to the store because it wasn't this organic pure sound reverb sound that I was looking for. Everytime I was buying one, the guy at the store told me "See you tomorrow when you return it". Finally, I returned the last one and bought this one which I can promise I am not going to return to anyone anytime soon.

This review was originally published on http://www.musicgearreview.com

barbes's review (This content has been automatically translated from French)" effective on the analog desk"

Electro-Harmonix Holy Grail
3 types of reverb!

I use the first 2!


easy !!!!
one button !!!!!! https://static.audiofanzine.com/images/audiofanzine/interface/smileys/icon_smile.gif


use on analogue desk
when live act dub! long as a hot main reverb sound slap well
following the purchase of a spring reverb mam, it went to my boss ph2 phaser to make it less dry (other auxillaire out of my table)!
ideal for reggae culture!
not heavy https://static.audiofanzine.com/images/audiofanzine/interface/smileys/icon_smile.gif)


I use it for 4 years ago on my Live (in the)

I use spring reverb I MAM hearts to vibrate the bass!
but I got lexicon MPx100, boss RRV 10 MidiVerb Alesis, Lexicon lxp5 Danelectro spring king

the Holy Grail is a slight reverb that takes up little space and sounds!
it is an effective effect for the price I will not begin to find fault

I now use a spring reverb rack but if I have to redo this choice of small effect reverb
it's simple EHX provides taf on my table Mixing

Ogmor's review (This content has been automatically translated from French)

Electro-Harmonix Holy Grail
This is a digital reverb, of course: we have the choice between 3 modulations, spring, hall or a mixture of reverb and flanger (flanger which acts only on the sound of the reverb, not the guitar signal ).
Otherwise, only one knob for assaying the presence of the effect, which acts as a balance between the effect and its gross.
It takes a standard mini jack power supply that is provided
It is not true bypass, but I do that is in effect which is dedicated loop, so it does not bother me.


Matter of principle, I do not waste time reading the manual a pédal not have one knob adjustment!
Not complicated to use in my view, from the moment we know what we want and what we do not want more the knob is turned clockwise, the more raw sound of the guitar will be low, and its effect envahisant, so "dirty". In my case, set to 13h, it gives enough presence to the effect without removing the raw signal, regardless of the modulation, it suits me


Reverb simulation is very convincing I find it does not sound cheap for a sub (haha)!
The Hall effect is also very good, but too typical for me to use than lead or its claira my opinion.
But my favorite is the sound "Flerb" with a flanger applied to the sound of the reverb, it gives a small side "space-psyche" that I love. Obviously, the sound of the flange itself is not adjustable, and it is a pity. But since this is un'un element that color the main effect is going very well this additional adjustment.


So I use it for years, to the low abbord, guitar now, mainly for solos.
I do not remember that she exuded blast or special coloring, but again, it's been over a year that it is only in an effects loop. Anyway, the sound of the effect itself, whatever the mode is excellent, very realistic.
I do not know what is the equivalent in today's Nano series, since my model no longer produced, but if you find this pedal OCCAZ at a reasonable price (it's not vintage either huh), I think it's worth it!

lerockeurfoudu33's review (This content has been automatically translated from French)" The 60s and 70s back in fashion"

Electro-Harmonix Holy Grail
analog and digital reverb
Three modes, a button in the intensity of the effect
an input and an output jack
9V adapter is provided (one less to buy)

nothing very complicated


The three modes are really beautiful
-SPRING: a reverb that is used on tube amps
-HALL: a classic reverb that find little holes on just about amps
-FLERB: a mixed reberb a flanger is quite funny as a mixture

No need for manual, anyway it is in English


nothing to say on it. given the quality of the effect that more than justifies its price.

that is perfect, I bought it because I have a Peavey ValveKing Royal 8 (perfect for blues and light crunch) that contained no reverb, so this pedal allowed me to complete my pedalboard is the moment consists of:
an Electro Harmonix Holy Grail (bought new)
a dunlop cry baby gcb 95 (bought used)
GE7 a boss (also bought used)
with all this in addition to the peavey tube I also use a marshall mg 30dfx

for me it's three pedals are and will remain a very solid base for playing blues rock hard rock show.


I use it for a good week.

I also tested the different reverb to less than € 100 and then Danelectro behringer and as the boss rv-5 but nothing I liked the fact that the only Danelectro SPRING, behringer is the brand most disappointing of music equipment (not impressive that the brand has disappeared), and the boss is a digital therefore what is good quality it is not enough for me my prize is a bit chilling.

the flerb but it is not really my style, the best is the two other

value for money is more than correct

Eяяаtom's review (This content has been automatically translated from French)" Plug & Play!"

Electro-Harmonix Holy Grail
Digital effect. An intensity adjustment, 3 modes.




Good sound quality.


the +
. Simplicity and efficiency

The -
. A second setting for the delay time can be ... ?

Grateu007's review (This content has been automatically translated from French)

Electro-Harmonix Holy Grail
analog reverb.



+ A knob to control the amount of reverb.


Ok, everyone talks about this reverb as one of the best reverb on the market. In my case, I am very disappointed. We lose so much the presence of the instrument and what is more, there is loss of volume ... Not terrible!