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Keeley Java Boost Guitar Effects Pedal  

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The Java Boost guitar pedal from Keeley Electronics brings back the same incredible response and sound quality of the heralded late '60s treble boost...Read More

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See All Keeley Overdrive, Distortion, Fuzz & Boost Effects Pedals

The most musical boost pedal ever built is back and better.

The Java Boost guitar pedal from Keeley Electronics brings back the same incredible response and sound quality of the heralded late '60s treble boosters, and with more control over the output frequencies range and boost gain. Handcrafted with the finest components, including the NOS Mullard OC44 transistors used in the '60s original. Especially killer in front of a tube amp. Cream colored knobs and violet LEDs.

  • Sound and response of the legendary '60s treble boosters
  • Enhanced control
  • Handcrafted
  • Uses the same transistors used in the original

Order today and give your sound a boost.


Review Snapshot®

by PowerReviews
KeeleyJava Boost Guitar Effects Pedal

(based on 7 reviews)

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Reviewed by 7 customers

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(1 of 2 customers found this review helpful)


Powerful Bite

By vraver04

from Berkeley, CA

About Me Professional Musician

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  • Compact Design
  • Loud Clear Brite Solid
  • Responsive


  • One Trick Pony
  • Tone Gets Lost

Best Uses

  • Boost For Solos
  • Performances

Comments about Keeley Java Boost Guitar Effects Pedal:

Does what it says it does, provides a big boost to the gain stage of a tube amp but slightly different than a true overdrive pedal. Loads of bite, over all good clean sound (no noise), well made. This pedal really will kick butt on the front end of your amp. But where it lost me was with the 2 and 4 positions on the pick-up selector on my Strat. The 'inbetwen' seetings have a unique tone that to my ears gets lost with this pedal. Maxxon, Ibenez 808 type overdrive pedals are more to my liking.

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By Kevin

from Florida

Comments about Keeley Java Boost Guitar Effects Pedal:

You must put this in front of a tube amp that is already breaking up, it's that simple. Do that & you will be rewarded with the creamiest singing sustain you have ever heard.
There's a 3 position toggle to select the frequencies to be boosted. The left pos is the full range boost (Iommi). The center is the classic treble boost (my fav). The right pos is the midrange boost (Clapton's Layla).
I plug my guitar > Philospher's Tone Compressor> Java Boost>Small Stone> THD Univalve W/4x12. It sends the THD from crunch into another galaxy. The distortion & sustain is creamy, full of overtones. It's a very distorted, the amount of bite can be dialed in with the Java's tone control. Also, feedback is right there, but controlable. I have a brian May Guitar that sounds delicious using this same signal path. The singing feedback is spine tingling. For more modern tone I use a OCD. Between the Java & the OCD, I can cover a lot of ground & can control most of the gain with the guitar's volume.
Just a few simple controls Tone/Volume knobs and a 3 position mini toggle switch
Very high quality internal components. Strong case.
It sounds very good, but it aint cheap. For the price, a power supply would be nice.

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(1 of 2 customers found this review helpful)



By MS413047

from Heart O' Texas

Comments about Keeley Java Boost Guitar Effects Pedal:

This review is my opinion. Yes, I know what opinions are like and what they are worth

Lots of other players swear by these but mine was an expensive doorstop an hour after I bought it.

My experience with Keeley will not be repeated any time soon.
I really don't get this pedal. Didn't sound good at all to my ears. Sorry, this emperor has no clothes

Tried it in the front end, in the loop, both before AND after buffers. Just sounds like a cheap ratty overdrive to me. None of my amps like it.
Okay quality. No better or worse than say my other stuff.

I WILL SAY, the actual pedal looks nothing like the pictures in the ad.
This price for a mediocre overdrive?

Might be worth it to someone who has money to burn but I get mine the hard way.

Definitely NOT worth it!!

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(1 of 3 customers found this review helpful)



By guitarzan-dQAq.

from Boston-MA

Comments about Keeley Java Boost Guitar Effects Pedal:

If you're looking for the pedal in the picture - forget it. You don't get the coffee cup or the cream colored knobs. Keeley changed the design and did not tell anyone - including thier own webmaster. Hopefully it's the same inside but they don't tell us that either. Hopefully you like the surprise in the box!

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(1 of 1 customers found this review helpful)



By zachtheripper

from Bloomington, IN

Comments about Keeley Java Boost Guitar Effects Pedal:

After realizing the Keeley Katana Clean Boost simply wasn't for me (I play in small places, no need for all those dBs), I decided to exchange it for the Java Treble Boost. I'm glad I did. This is another of those subtle Keeley pedals that you don't really realize how much need until you turn it off. I give it a stomp for all my solos (using the middle toggle switch for treble, with the knobs both at 1 o'clock), and really helps those thin upper-stringed notes sing all day long. Also, as it's not a clean boost, you get this punch to your notes that makes them more defined and in your face. Run after a Keeley Compressor and before a vintage ProCo Rat (with the lm308n chip) it sounds devine! The pedal is based on the old Texas Ranger boost pedal, which Clapton used mainly in the Bluesbreakers, and while I could've gotten their re-issue pedal (which Warren Haynes uses, among others) I am supremely satisfied with this one. I'd say check that one out else as well, it's on this site, but for me Keeley is where it's at.

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By The Boogie Man

from southern California

Comments about Keeley Java Boost Guitar Effects Pedal:

I had heard Of treble boosters I did some research and bought a Java Boost Its an "old school" Circuit .It has the Mullard Oc44 inside, The one that is talked about amongst Gear heads. The pedal was designed to be played with a tube amp that is already distorting a little . It drives the Full /mid / treble Frequencies into your tube amp, all selectable by a mini toggle switch I leave it on all the time It is an integral part of my sound I think of the "Whole lotta Love"solo, Black Sabbaths" Wicked World" solo. It approaches a Brian May sound

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Spectacular and Versitile

By Anonymous

from Undisclosed

Comments about Keeley Java Boost Guitar Effects Pedal:

I just received my Java Boost today and I must start by saying that it is everything I wanted, needed, expected in an FX pedal!!!I am able to use it with my Les Paul and Strat with a simple flick of a switch.I love the bite and clarity added to the Les Paul (difficult with a distortion of overdrive pedal) and the Umph added the the Strat. Both guitars clean up perfectly at the volume knob on the guitar without losing volume (also, something that can not be accomplished with a destortion or overdrive pedal).I use a Marshall SPL 100 handwired or a Mesa Mark III and both can be dialed in quickly and perfectly. The Java Boost can operate perfectly without any other pedal in the chain if desired, and my vintage Wah has no problem with either guitar in front of the Java Boost.Thanks for a great product! (I also have and use a Katana)

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