Marshall Shredmaster comprehenisve. best schem / layout? small enclosure? mods?

[Bricks]

Hello - I'm a long time lurker, first time poster.
I've done some digging via search to get a good Shredmaster schematic and layout, but have encountered lots of issues. I've summed up the majority of em here. Basically, I'd love to build a Shredmaster in a small enclosure (small MXR enclosure would be great, or anything in that ballpark)

http://www.diystompboxes.com/smfforum/index.php?topic=31514.0
That post confuses me aplenty. There are links to layouts/schems.. and some unresolved debate as to reliability of the values.

The handmades.com.br one looks pretty comprehensive.. gonna get my rommate to help me with the translation. And thats the one I'm leaning toward

alternatively, OLC just started offering a clone kit modded to have more gain and treble.
http://olcircuits.com/olc_shredmeister.html
Seems like that might just be easiest, though Mark @ OLC thinks it'd be impossible to squeeze it into a smaller enclosure.

That said, others have built clones into small enclosures, as demonstrated here:
http://microjunkers.blogspot.com/2006/04/shredmaster.html
http://microjunkers.blogspot.com/2006/04/shredmaster_02.html

One could even consider using some of those two-in-one pots like on the newer marshalls if space is ubercramped.

Other potential issues: Mark Hammer has noted that C13 seems wrong at 2200pf.

Potential Mods:
People have suggested both 100pF and 330pF in place of C17.

I know the Shredmaster is controversial given its high price on ebay (thanks to Jonny Greenwood alongside My Bloody Valentine misconceptions).. Some people love it, some people think its ass..

Me? I'm just curious to get some dirt, as I only have fuzz and OD, plus I want to get back into pedal-making. Before I call it a day and build a RAT, or buy one of those new GuvNors, I'd love some help!

Thanks !
Chris

[Bricks]

howabout this then.. anyone want to post pics of their Shredmaster build?

[Mihkel]

I converted an Ibanez SH7 into a Shredmaster for a friend. Just went by the schematic and used perfboard. Also built one for me, with a huge PCB layout, there is also a smaller one around, but I can send you the layout I used if you're interested.

[sshrugg]

I've been working on my own shredmaster build, as well.  Due to those high ebay prices, I have no original to compare values with.  However, there are many discrepancies in the values for capacitors.  I'm working a lot with the last schematic in that post you mentioned:

But that's frustrating as well, seeing as the units of capacitance are not marked on all but a couple.

Mark Hammers concerns about the values make sense, but he mentions how it doesn't sound like it'd give you a really "shreddy" sound.  In fact, a lot of people have said their builds sound really dull and muddy.  However,

Some people love it, some people think its ass..

I think that has a lot to do with it's reputation for not being too shred-crazy.  Because of that, I wonder if those values Mark pointed out are actually correct.  I'm sure with some tweaking we could manage a decent sound.  But I want to get the REAL sound!!

Like I said, I've got no basis for comparison.  Is there anybody out there with an original Shredmaster they could check out for us?

If you people need more to get interested.  I promise a build report with pictures, schematics, pcb layouts, EagleCAD files, sound clips, parts list - the whole shebang.  I'd like to get this settled so other people can have an easier time, too.

[slacker]

I haven't seen a real shredmaster but the handmades.com.br one looks reasonable apart from C13 and C18 which should probably be 220pf and 100pf. The first 2 op amp stages look right, they're basically the same as the Guvnor.

[dano12]

I have a shredmaster--would be happy to pull it apart in the name of science and measure values if that would be any help.

[grolschie]

Some people say that the Shredmaster is reasonably dark. The drivemaster is the other pedal to consider. Less hyped though.

[MartyMart]

I have three Shredmaster schems and the part numbering is slightly different on all of them.
The C13 that you mention as 2200pf, on all of these connects to one side of the contour pot, these
values either side of the pot, lugs 1 & 3 are all 0.047uf and 0.1uf, wiper goes to Vbb ( 1/2 V )
The numbering is between C12/C13& C14 on these caps ! so where is this 2200pf cap ?
What's a little wierd is that off the gain pot towards IC1 pin 6, two schems show 0.068uf and an 8k2
and one shows this followed by link to the switch and then a 4k1 and 0.1uf cap
Some more numbering is wrong, but all the rest of these schems "match" and all include values for
caps and resistors ..... are any of them correct ? .... who knows ....
C17 BTW is always a 1000p ( 1n )
With 5 pots, this is going to be tight even in a 1590BB !
MM
This looks like a good version : http://users.chariot.net.au/~gmarts/ampovdrv.htm
Scroll down .....

[ambulancevoice]

isnt the shreadmaster on olc?

EDIT: hahaha, i just read the first post completely, never mind

[grolschie]

This looks like a good version : http://users.chariot.net.au/~gmarts/ampovdrv.htm
Scroll down .....

Note that the author of that page states:
"I've also shown portions of the schematics of these pedals to explain their unique fetaures.   These schematics are not complete; they show only the effect signal path, and not all component values are shown."

[MartyMart]

Note that the author of that page states:
"I've also shown portions of the schematics of these pedals to explain their unique fetaures.   These schematics are not complete; they show only the effect signal path, and not all component values are shown."

Yes I know, but in this case it's the "whole" audio path ( true bypass added and you're done ! ) and all the
values are indeed listed.
I built a similar one on my gallery called "Shed Master" with just gain and volume which sounds great !! from this
schem BTW .
MM.

[dosmun]

BYOC is coming out with Shredmaster board or kit.

[sshrugg]

Thanks so much, everybody!!  Dano, your willingness is appreciated.  To save some trouble of checking every component, I'm going to go through the 4 or 5 schematics I've got and compare values.  Then I'll post a new one with everything people agree on.  Then we can hunt through the rest.  Is that alright?

[sshrugg]

Sorry it's taken me so long to go through this.  Work has been insane.

I've drawn up a new circuit in EagleCAD, and now I need to spend some time going though all the others and seeing which parts match, and which ones don't.  When I'm done (hopefully tonight) I'll post a comprehensive, and then we can narrow in on what needs to be clarified.

[mrsage]

http://www.buildyourownclone.com/shredder.html

Note that Keith also sells just the PCBs.