EHX - Big Muff Pi 2007 [schematic]
- Bernardduur
- Transistor Tuner
Today I got a 2007 EHX Muff in and yes, again, they differ from all the before models
So, for the persons who like to complete their collection, here's the schematic
Linkie
Transistors are BC550's; diodes are 1N4148's
So, for the persons who like to complete their collection, here's the schematic
Linkie
Transistors are BC550's; diodes are 1N4148's
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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- analogguru
- Old Solderhand
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It´s funny that after more than 35 years of BigMuff history it appears that the people at EH can´t stop to tweak around with this circuit....
But because it is Christmas I will tell you a "secret":
The 2007 Version is nothing else than "back to the roots" and the component values are the same as used one the first prototype(s) Triangle-Muffs which were build on perfboard. You have seen the guts ?
analogguru
But because it is Christmas I will tell you a "secret":
The 2007 Version is nothing else than "back to the roots" and the component values are the same as used one the first prototype(s) Triangle-Muffs which were build on perfboard. You have seen the guts ?
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- Bernardduur
- Transistor Tuner
Cool!analogguru wrote:It´s funny that after more than 35 years of BigMuff history it appears that the people at EH can´t stop to tweak around with this circuit....
But because it is Christmas I will tell you a "secret":
The 2007 Version is nothing else than "back to the roots" and the component values are the same as used one the first prototype(s) Triangle-Muffs which were build on perfboard. You have seen the guts ?
analogguru
The build quality was OK although I really disliked the solder used and the ribbon cable that connected the switch with the PCB; that was the reason it came to me as these points were damaged
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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- bumblebee
- Diode Debunker
my favorite muff is the current (06 PCB) model, its probably the same as this.
i dont like the rams head,its muddy,or the russian,its weak and poorly made.
one fault i find with EH TH PCB's is that the trace is very thin and breaks easy if you wana mod it,my bmp looks more like its been built on perf with all the repairs ive done to the traces due to modifying it.
the SMD PCB's look and feel real good though!
i dont like the rams head,its muddy,or the russian,its weak and poorly made.
one fault i find with EH TH PCB's is that the trace is very thin and breaks easy if you wana mod it,my bmp looks more like its been built on perf with all the repairs ive done to the traces due to modifying it.
the SMD PCB's look and feel real good though!
- Meanderthal
- Breadboard Brother
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- Joined: 03 Sep 2007, 22:24
Hey, this does look different. This is the new NYC version? I haven't seen those 0.47uf decoupling caps at the input and the in of the last gain stage before... interesting. I wonder if that's enough to tame the usual mud... probably for some amps... and all those 10k resistors remind me of the Russian ones... mid notch shouldn't be too extreme with those tonestack values.
Thanks!
Thanks!
- Bernardduur
- Transistor Tuner
I also wondered about the 500k log pot as the volume pot; would this change anything when compared to a 100k log pot there (as in all the other versions)??
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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- bajaman
- Old Solderhand
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It will roll off some more highs - less fizzy soundingI also wondered about the 500k log pot as the volume pot; would this change anything when compared to a 100k log pot there (as in all the other versions)??
bajaman
- Bernardduur
- Transistor Tuner
Thanks!bajaman wrote:It will roll off some more highs - less fizzy soundingI also wondered about the 500k log pot as the volume pot; would this change anything when compared to a 100k log pot there (as in all the other versions)??
bajaman
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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I think it would be the opposite !!!!bajaman wrote:It will roll off some more highs - less fizzy soundingI also wondered about the 500k log pot as the volume pot; would this change anything when compared to a 100k log pot there (as in all the other versions)??
bajaman
As in guitars, the higher the value, the higher the output level and the highs.
Maybe I'm wrong ???
Patafix... so sticky
- bajaman
- Old Solderhand
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yes you are wrong - because you will unlikely be running the output level on full and the larger series resistance will roll off more highs in conjunction with the input capacitance of the proceeding stage.think it would be the opposite !!!!
As in guitars, the higher the value, the higher the output level and the highs.
Maybe I'm wrong ???
Try turning your guitar volume 500k pot down to half way and listen to the loss of highs (unless you have a treble bleed bypass capacitor fitted to your poti).
bajaman
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- my favorite amplifier: Selmer Zodiac
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But this not change with other pedal in the audio chain?
It's not better to filter off some highs with a capacitor from output to ground?
Another question... I have a small clone and it have a 47ohm resistor between the - of the power jack and circuit ground..
can be this the definitive cure for ground loops problem?
It's not better to filter off some highs with a capacitor from output to ground?
Another question... I have a small clone and it have a 47ohm resistor between the - of the power jack and circuit ground..
can be this the definitive cure for ground loops problem?
bajaman wrote:yes you are wrong - because you will unlikely be running the output level on full and the larger series resistance will roll off more highs in conjunction with the input capacitance of the proceeding stage.think it would be the opposite !!!!
As in guitars, the higher the value, the higher the output level and the highs.
Maybe I'm wrong ???
Try turning your guitar volume 500k pot down to half way and listen to the loss of highs (unless you have a treble bleed bypass capacitor fitted to your poti).
bajaman
- Dirk_Hendrik
- Old Solderhand
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Since when did you change over to German terminology !!??bajaman wrote:your poti
- bajaman
- Old Solderhand
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Since when did you change over to German terminology !!??
bajaman
be kind to all animals - especially human beings
- Bernardduur
- Transistor Tuner
YES! They do it again! The 2008 model??? Again one with changes from the 2007 model
Linkie
Transistors are BC550C's, diodes 1N4148's....... all caps ELCO's except for the tone stack which are ceramics
Sounds even worse
Linkie
Transistors are BC550C's, diodes 1N4148's....... all caps ELCO's except for the tone stack which are ceramics
Sounds even worse
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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- Rocket Roll
- Solder Soldier
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I have this one too. Totally useless. I had to change all 1uF electrolytics to 0.1uF ceramics to remove all the excessive bass.
Now it sounds ok-ish.
The pcb is for sure not suitable for modifications, even with moderate heat I managed to damage it.
There are also a few electrolytic caps (2 220uF and one 2.2uF) that I have not seen in previews schematics.
Now it sounds ok-ish.
The pcb is for sure not suitable for modifications, even with moderate heat I managed to damage it.
There are also a few electrolytic caps (2 220uF and one 2.2uF) that I have not seen in previews schematics.
- bumblebee
- Diode Debunker
The schematic of this is already posted in this forum some place.
Thanks for the pics though, this is the onyl modern muff i dont yet own.
BTW, some of these come with a blue PCB.
Thanks for the pics though, this is the onyl modern muff i dont yet own.
BTW, some of these come with a blue PCB.
I so dislike the modern digital world that I need to use semi-digital effects to emulate the analog world of cassette, VHS, and vinyl.