Torchy's MXR ZW44

G Kresge · March 20, 2005, 04:46:32 PM

Anyone have a mod for the SD1 to get the same effect as the ZW?

cd · March 20, 2005, 05:09:18 PM

Quote from: G KresgeAnyone have a mod for the SD1 to get the same effect as the ZW?

Change the tone caps to .047u.

G Kresge · March 20, 2005, 08:05:02 PM

Sounds very simple. Is that all there is to it!?

Which caps are they exactly? (ie: C1, C2, etc)

cd · March 20, 2005, 08:34:39 PM

There's more to it, but unless you want to rip out all the FET switching, the output buffer, and install a 2nd small PCB for a different input buffer, changing the tone caps will get you 99.999% there. Seriously.

The tone caps I'm referring to are the ones connected to the tone control.

G Kresge · March 20, 2005, 09:03:42 PM

I'll give it a try. Thanks CD.

petemoore · March 20, 2005, 10:04:03 PM

If I read the board right, there's a 1m8 series resistor at the input?
Seems comparitively large....

cd · March 20, 2005, 11:17:13 PM

Quote from: petemooreIf I read the board right, there's a 1m8 series resistor at the input?
Seems comparitively large....

You're reading it wrong.

vanhansen · March 20, 2005, 11:35:24 PM

I just got one of these today. This is one great sounding overdrive. Sure, it's an SD-1 clone per say but the Dunlop R&D team sure did a good job putting this one together. The tone of my Marshall is still there with this but with more grit. The SD-1 colored the sound a lot more compared to this. I haven't disected it yet to look at things but I'm sure I will soon. The nature of the beast.

col · March 21, 2005, 02:28:40 AM

I tried a few different transistors over the weekend in this and all of them worked. The ones that sounded closest to the MPSA13 were an un-numbered Mototrola and a BC109C. I couldn't decide which sounded best, both were clear and powerful. A 2N3904 and a BC184C sounded very dull and a 2N2222 was not up to the standard of the others. I hope this helps if you can't get an MPSA13.

larseko · March 22, 2005, 07:34:46 AM

Quote from: kojjumAlmost finnished my build yesterday with parts I had laying around as well. Found a reseller that stocks the MPSA14 in Sweden, www.bejoken.se Will contact them later today and see if they sell to private persons or if you need to have a company.
...
//jens

Also, the NTE 46 is a replacement for the MPSA thing. Elfa (http://www.elfa.se stocks all the NTE transistors. A bit expensive (33 NOK in Norway), but that's fine for this pedal

Lars Erik

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Torchy's MXR ZW44