Home › Forums › Help/Technical Questions › Big muff mods please help

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  • February 4, 2010 at 9:00 pm #79816
    Jfy05
    Member

    Hey I’m Jeff and new to the forum.

    I bought a big muff pi USA reissue and had a question regarding the tone stack mod found on your forum; there is a picture posted showing a rev a board. I have a rev c board that features the 10 nf cap at c8; I was woundering if that was the second cap shown in the picture as I can clearly see c9. Also the caps are ceramic disks the caps I picked up for the mod are I believe poly film will my 10 nf poly make much difference?

    Thanks, Jeff.

    February 4, 2010 at 9:35 pm #107136
    Ned Flanders
    Moderator

    Forget about the designators like C9 etc on the revision A board, they don’t apply to the revision C board as the rev C PCB had different designators.

    Tell me what mod you want to do and I can help you out with your revision C board.

    BTW, the 10nF cap is the one that has 103 printed on it. Cap type will make no difference.

    February 5, 2010 at 3:47 am #107145
    Jfy05
    Member

    The mod I’m Planing on doing is the NYC three way tone switch.
    I just realized I didn’t link to the photo of the mod ha! Anyways here it is
    http://i1016.photobucket.com/albums/af286/fenderamerica/Pedal Schematics/NYCEC3003-A3WAYTONESWITCH.png

    What I’m assuming is the tone section is the same on paper just laid out differently and different values.

    -Jeff.

    February 5, 2010 at 9:14 pm #107157
    Ned Flanders
    Moderator

    Give me some time and I’ll make a little diagram of what to do on the Rev C PCB. Its exactly the same mod,parts etc, just different connection points as far as designators go.

    February 5, 2010 at 9:29 pm #107159
    Jfy05
    Member

    Great thanks!

    February 6, 2010 at 1:32 am #107166
    Ned Flanders
    Moderator

    Here you go: http://i1016.photobucket.com/albums/af286/fenderamerica/Pedal Schematics/NYCEC3003C3WAYTONESWITCH.png

    February 6, 2010 at 5:51 am #107171
    Jfy05
    Member

    That is quite awsome!!

    Thank you.

    February 6, 2010 at 7:51 am #107174
    Ned Flanders
    Moderator

    No problem!

    March 22, 2015 at 7:31 pm #120599
    thuggyBear
    Member

    Thought I’d jump in here…

    Brian Wampler wrote an article on the black Russian Muff here:

    http://www.premierguitar.com/articles/Electro_Harmonix_Russian_Big_Muff_Pi_Pedal_Mods

    I was interested in trying out some of these mods. I didn’t want to chop up my beloved 3003 rev_E muff, so I bought another used in order to experiment.

    However, very few of the values match up. Is there an NYC 3003 Rev_E schematic you could post? I’m trying to trace it out myself, and I’m worried I’m going to ruin my pedal.

    March 25, 2015 at 12:49 am #120602
    thuggyBear
    Member

    Also, is this switch supposed to be in parallel with the existing caps?

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