EH - Muff Fuzz ( Electro-Harmonix )

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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alteredsounds
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Post by alteredsounds »

Will get better boards pics up shortly.

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DWBH
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Post by DWBH »

I just love those knobs.

analogguru
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Post by analogguru »

Interesting, on all units I have seen until now (7 pcs) there were 3 ceramic caps (100n/12V) mounted on the solder side.

Is there a possibility for a photo of the component side ?

analogguru
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alteredsounds
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Post by alteredsounds »

sure mate, will get to it.

Meanderthal
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Post by Meanderthal »

Hey! The input is a jack, not a plug. How come I never saw one like this before? It doesn't look like a mod. Edit: or is it? The masking tape, the solder glob...

prehistoric
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Post by prehistoric »

hi meanderthal, a special albuquerque hello
i remember the progression of the EH effects from the 70s
at first they followed the dan armstrong example, effects you could plug into your guitar. i also recall that they were available with the male plug on either the amp or guitar side, can anyone else confirm this?
popular feedback from the dealers (guessing, educated guess) caused EH to switch to double female jacks by the early to mid 70s. the picture shown is 2nd generation graphics,
i had an LPB1 in the late 70s but it was a very early model with the first generation graphics, simple block letters. had the male input plug.
the circuit was the famous 'flying lead 'style, it was a mess inside.
but it drove my 68 twin into overdrive which i needed at the time.

prehistoric
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Post by prehistoric »

2nd gen graphics on lpb1
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fatrack
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Post by fatrack »

Speaking of messes - I've got what looks to be a 2nd gen muff fuzz that has seen better days; a friend gave it to me hoping I could repair it. I don't have any electronics background but I've built a couple of pedals and am enjoying learning about this hobby as I go. I've tried to get a schematic that matches up to this pedal, but the only one I could find for the opamp muff fuzz was at g.g.g. and indicated incorrect capacitor values. I tried to trace out the circuit but it never seemed right to me. The jacks are gone, as is almost all of the hookup wire. It seems clear upon looking at alteredsounds *very* enlightening photos that somebody went wild with the iron on this thing - there are scorched marks and traces melted together. Also, there are only two capacitors, both of which have a broken lead. Anyway, I took a series of photos, including the component side that might prove interesting. I've enjoyed lurking around here and learning from the members, so perhaps this will be helpful to you all.
John
https://s237.photobucket.com/albums/ff31 ... ff%20Fuzz/

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alteredsounds
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Post by alteredsounds »

god someone made a mess of that! I'll try and compare bits of mine to urs and post results etc

analogguru
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Post by analogguru »

Nice (and complete) guts deserve a nice:

EH Muff Fuzz schematic (1977)

enjoy,
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

fatrack
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Post by fatrack »

Very nice, this forum is great :D
Analog - thanks for that; even with my imprecise skills I should be able to make some sense of this circuit now...
Altered - thanks for the help! I've looked around for just such pictures but never found them until I started hanging out here. Ironically, I looked for info on the opamp muff fuzz when I first signed on to this board and found nothing. A couple of days ago I photographed my mangled muff, looking to appeal to the board's members for assistance, and I found your thread while performing a courtesy search on related topics immediately prior to posting. What perfect timing! Either way - right on the real, death to the fakers - freestomps(and specifically the people that hang out here i.e.altered and a.g.) has been a tremendous source of knowledge for me.
thanks
John

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alteredsounds
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Post by alteredsounds »

Just tryna get the thing apart right now and will get the pics :)

Rodgre
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Post by Rodgre »

I have a Muff Fuzz (my first pedal!) that I bought brand new, and while it had two jacks, instead of a jack and a plug, it had the same blobby solder and masking tape. That's how E-H rolled!

I need to dig it out and remind me of what my youth sounded like.

Roger

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Post by patafix »

analogguru wrote:Nice (and complete) guts deserve a nice:

EH Muff Fuzz schematic (1977)

enjoy,
analogguru
What is the resistor that determines the input impedance of this pedal ?

Is the input impedance of the opamp Muff Fuzz higher than that of the transistor Muff Fuzz ?

Thx
Patafix... so sticky

analogguru
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Post by analogguru »

patafix wrote:
analogguru wrote:Nice (and complete) guts deserve a nice:

EH Muff Fuzz schematic (1977)

enjoy,
analogguru
What is the resistor that determines the input impedance of this pedal ?
It is R1.... 100k
Is the input impedance of the opamp Muff Fuzz higher than that of the transistor Muff Fuzz ?

Thx
Yes... slightly.... I would assume the transistor muff fuzz at approx 50k

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Post by JHS »

Different circuits of the opamp Muff-Fuzz are common, 'cos EH had done some revisions over the years and adapted parts to the IC they used to use.

JHS

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Post by Miracle Man »

Holy thread resurrection! [smilie=sorry.gif]

Does anyone have analogguru's schematic? The link above does not work, and judging by the description, it seems to be exactly what I'm looking for.

Tnx!

el wouterito
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Post by el wouterito »

Hi!!

I'm trying to fix an old muff fuzz myself, but i can't find the original schematic anywhere... does anybody have analoguru's available??
thanks a million!!!

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Post by POTL »

el wouterito wrote:Hi!!

I'm trying to fix an old muff fuzz myself, but i can't find the original schematic anywhere... does anybody have analoguru's available??
thanks a million!!!
Schemes of all muffs and most of their clones
http://www.bigmuffpage.com/Big_Muff_Pi_ ... part1.html

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