Monday, 31 March 2014

EarthQuaker Devices Hoof Fuzz

Interesting take on the Muff with LEDs replacing the usual silicon diodes and germanium transistors for Q2 and Q3.  Info about the original from the manufacturer:

Our flag-ship device! The Hoof Fuzz is a germanium/silicon hybrid fuzz which is based on character of the classic green Russian muff. It is capable of creating everything from dirty and organic overdrive to monstrous fuzz madness. It features a smooth, natural and harmonically rich sustain that is less associated with muff style fuzzes and has more in common with an overdriven amplifier. The Hoof Fuzz has some real clarity and distinctiveness that provides a tight and controlled signal that will surely be heard through the mix. The Shift control is secret weapon of the Hoof. It changes the frequency response of the tone control, primarily on the treble side, but it also diminishes any unnecessary muddiness on the bass side too. Scoop the mids or boost them- lots of tonal shaping options are on tap! The Hoof Fuzz has become a key pedal for TONS of well known artists in both the studio and on stage. All analog, true bypass and made one at time by human hands in Akron, Ohio (the center of the universe).
Measures

Controls

Fuzz: Clockwise for heavy, counterclockwise for light.
Tone: Bass to the left, Treble to the right
Level: Controls the output level.
Shift: Adjust the mid content. Clockwise for classic scooped mids, counterclockwise for the more modern cutting mids all the kids love.







40 comments:

  1. Any replacement suggestions for the 2n1308?

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  2. Small Bear has a 2N1306 PNP. Is that compatible? Aren't the even numbered one PNP and the odd ones NPN? Or did it just work out that way? Is the 2N404 usable here?

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    1. You need to use NPN transistors but pretty much anything would be ok. I just bought some 2N1306's for an Openhaus, so that will probably be a good choice. It doesn't follow the even or odd last number rules, although the 1306, 1308 and 1310 are all NPN, so Smallbear must have them marked up incorrectly.

      Russian MP38A's may be pretty good for this too, although maybe not quite as much gain as you would like, but they can be found cheaply and in quantity.

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    2. Nah, I got it wrong. Old man syndrome, I suppose. I may try the 1306's. Thanks

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    3. My 1306's from Small Bear work great!

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  3. I noticed a couple of value changes I missed, so if you want to build it grab the latest layout now posted above.

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  4. OH MY GOD YES! This is number one on my most wanted-list. Ordering the parts already. You're the man!

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  5. I had a original. Sold it. A BYOC LB took his place (so freakin awesome, kicked its butt!)
    Nonetheless, the Hoof is really very, VERY good Muff take.

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  6. I dunno why I'm so excited to see this, because I bought the original and kinda hated it, but still wanna build one for some reason

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    1. I was the same with the OCD V4. I really don't like selling pedals, I've only ever done it when I really didn't like something and it's happened maybe 3 or 4 times in my life. I hated the OCD, I thought it was completely over rated and it just seemed to take all the meat out of my tone. But I still had a feeling of wellbeing when I did the layout for it, because at least I know now if I ever do want it again, I can just make one instead of wasting my money again. OCD is a bitch :o)

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  7. Hi Mark, I built this early this month using my own layout which is based on one of your other big muff layouts, so this one is almost identical to mine. The values and components look good to me.

    This is my build:
    http://4.bp.blogspot.com/-TzbpAtpcA_Q/Uy1P8fboojI/AAAAAAAAC3U/V8VsHtJSh9M/s1600/hoof_inside.jpg
    http://3.bp.blogspot.com/-Qk1XEnVeJdM/Uy1P7iRaGOI/AAAAAAAAC3I/8Dj_hLxjs14/s1600/hoof_front.jpg

    I have to change the lower left resistor, I used 390R instead of 100R but it sounds good.

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  8. oh that comes too late already built a muff, now i really wish you had schematics here so that i could compare, hard to do for me with the layout only, but thanks anyway

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    1. You'll never see the schematics here unless either we did them ourselves, or we have permission to post them. If we don't we're not going to do anything which could have negative implications for the site. But like we've always said, the schematics for 99% of the layouts we do here can be found easily on freestompboxes.org, so if you do a bit of searching, I'm sure you'll find it no problem.

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    2. 'modified Violet Ram's Head Big Muff'
      many a big muff schematics posted here:
      http://www.bigmuffpage.com/Big_Muff_Pi_versions_schematics_part3.html

      I am going to have to build a HOOF! This one to me sounds better then my cival war muff and will be interesting to try different transistors in this one...
      Thanks for this one IvIark~!

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  9. I built the layout posted by JohnK under the Crimson Drive page (http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/Hoof/01-Hoof-VERO.png).
    I know that it was based on the Hoowf fuzz layout from BigMuffPage.com (http://www.bigmuffpage.com/images/schematics/Hoof%20Schematic.jpg)

    One difference I see here is the 100u cap from the 9v to vol1 (?)......
    Is there a schematic similar to the Hoowf Fuzz for this layout? I noticed that my build didn't sound too close to Hoof Fuzz. If this part of the circuit is different then I will build this one as well. FYI JohnK's sound really good but I want the Hoof tone.

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    1. That's the schematic I did it from too, and that cap is just a PS filter from 9V to ground and so unless your last build was noisy, isn't going to make a difference if everything else matches.

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    2. Awesome thanks!! It is only noisy when the volume knob is cranked. I would expect noise with the amount of volume it has. I must say this site is AMAZING and thank you for all the effort.

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  10. Hi there, I'm fairly new to building effects, in fact this is my first build and this may sound like a stupid question but here goes, I noticed on your diagram is says Volume 2 to Output, does this mean wire Volume 2 straight to the tip of the Output jack? Does this then bypass the need for a board output connection?

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    1. It means volume 2 is the final output of the effect, so that is what goes back to the stomp switch which is then wired as per the Offboard page.

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    2. Ahh, thank you very much. This all makes sense now.

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  11. Built this. I have a bunch of AC176 and AC187 and tried them. Even the ones with the highest Hfe did not deliver the gain heard in the PGS demo. I tought why not trying some Si diodes? So I swapped all four to MPSA18. And yes, that's it for me. Now it's not far from a standard Big Muff, but with the extra Shift control and the Hoof's tone stack. Love it. Will do some comparison with my Fire Red Fuzz clone and will see which goes into my board.

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    1. And of course I swapped the transistors not the diodes. So I'm using now 4x MPSA18 transistors...

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    2. What sort of gain Ge did you use? Unfortunately I don't know what gain they were in the original and so we don't have a point of reference, but I think that should still make this verified, so thanks for that buddy.

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  12. Was there a previous version to this layout? I built the one that popped up on Google first. This is only my 3rd build and I am still not good finding issues. At max the volume is at unity, and there is very little gain. I used 2n1306 work a likes from small bear. I am wondering if anyone can help?

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    1. Possibly but I can't remember :o)
      This was originally posted on 31st March and the creation date of the latest version of the layout graphic file is the 19th April. That doesn't necessarily mean anything significant was changed, I may have just shifted things about a bit if I didn't like the look of something which I do with most of the layouts.

      The best way to fault find in the first instance will always be to measure the transistor voltages, so if you can do that and post them here it will give us a good clue.

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    2. Q1
      E .033
      B .639
      C 4.12

      Q2
      E 1.387
      B 0
      C 1.397

      Q3
      E .034
      B .108
      C 3.71

      Q4
      E 1.131
      B 1.742
      C 4.15

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  13. Is Q2 bad. I am just wondering if I should get new transistors

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    1. The only voltage that looks like what I would expect is Q4, so I'd be checking part placement, soldering and values from the start. Q2 is miles off and the most obvious problem area, but whether it's the transistor or surrounding components needs to be established by looking at what you've put together closely.

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    2. Well easy enough Q2 and 3 were backwards. Works great now thanks!

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  14. Hope someone cal help with this... Does it matter if the LEDs are 3mm or 5mm?

    Thanks!

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    1. Nah not really, just experiment. Get some SIP sockets ;)

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  15. Hi everyone,

    I just build the pedal and generally it works, but the amplification is rather low and the distorted sound is quiet farty. So I have to crank the Volume knob to match my clean Volume. I used AC 173 with HFE 90-100. Is that normal????

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    1. Sounds like your transistors are misbiased. I dunno, it could be a number of things. I guess you should test your voltages against one which is working properly.

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    2. Thanks, Charles. I should measure the voltages and post them.

      I fear I probably grilled the Ger Transistors because I hat them build in in the wrong direction first. So this might be the reason....

      Another thing. The Clipping LED do not light up during plying. Is that normal? I have build a rat clone some time ago and there the clipping LED did light up when increasing the gain....

      Thanks for your help...

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    3. I managed to fix it. I mixed up an 100 Ohm Resistor with 100kOhm :). No it works....

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  16. This comment has been removed by the author.

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  17. Hi! Does anyone know anything about the version "cloven"?

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  18. Hi. I live in Brazil and I don't find any NPN Ge hear. Can i use only silicon NPN for build this? Any suggestion?

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    1. Yes but it will most likely sound a little different. Give it a try it wont hurt anything.

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