Tuesday, 25 February 2014

EHX Germanium4 Big Muff Pi

Ok. This has absolutely nothing in common with all the other 14 different versions of Big Muff Pi. As the effect has two individual sides, one for distortion and other for overdrive, i thought i'd draw the sides as a separate layouts. You can, of course, use one 16 x 31 board to have both effects on a single board.  Or tweak one of them to your liking and fit it in 1590B. With eight pots and two stomp switches, i don't see even Javi fitting all of this in 1590B :)





10 comments:

  1. > With eight pots and two stomp switches, i don't see even Javi fitting all of this in 1590B :)
    Ha ha, oh you had to challenge him didn't you! :o)

    This is a bit of cheating from EHX to add NKT275 mojo and then end up using them as clipping diodes in the distortion side.

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    1. I sure would like to see him succeed! :P

      Design is pretty non-standard, which is nice. I'd still say it's a waste of NKT275s though...
      +m

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    2. Sadly, I have to admit that this one is imposible in a 1590B.... maybe in a 125 :) If I build this one will be in a Retex RM6, it wuld fit perfectly, but I find two problems for building this effect:

      - I think too that this is a waste of germaniums
      - You can get this effect used in great shape for about 50-60 euros.

      J.

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    3. You could use some cheaper germs than NKT275s. I think it could even sound better with silicon transistors..

      Used ones seem to go for 60-70€ here, but still pretty cheap. Main reason for drawing this was that either of the circuits could be tweaked and used separately.

      But of course i needed to tease you Javi! You have done quite a few impossible squeezing ins in the past :)
      +m

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  2. I had the original and it was a fairly decent pedal, quite fun to tweak. Might revisit via DIY. Thanks!

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  3. Silly questions, but are the nkt's are being used for clipping in both circuits? Cause I was thinking if they are, then wouldn't this be a great use for those low gain, leaky Ge's we may have laying around? From all the Russian Ge's I've started hording there are a few in the 20-30HFE range, and have been looking form good uses for them. I was also thinking this would be a good canvas to tweak for more low end retention, maybe even add a blend control to for a great bass fuzz/od/distortion..

    Also, as a side not, I've been on the lookout for one of these used for awhile, and either people want close to the new price for them, or they're all new.

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    1. Only on the distortion side, there you can even use Ge diodes if you want.

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  4. There's obvious error on the dist side layout. I'll be updating it soon...
    +m

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    1. awesome miro. i haven't had any time to build anything for awhile, so i can't check to verify either layout. hopefully someone else can soon, would love to play with these when i can build again. also, any idea of approx. HFE for the nkt's for the od side?

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