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  • in reply to: looking for 70s op-amp Little Big Muff EH1322 help #98092
    baeheezelmauth
    Participant

    the old brown paint just melted off when i wiped it down with rubbing alcohol…
    I gasped at first, but the yellow was unaffected.

    there is not alot of room in there for more stuff so I had to squeeze those other pots in…
    and I have a bin full of salvaged knobs so Im gonna let the owner pic some to taste.

    in reply to: looking for 70s op-amp Little Big Muff EH1322 help #101079
    baeheezelmauth
    Participant

    thanks so much for the terrific help…

    I dont even own a guitar, so i have only tested this with a func.generator..
    but all systems seem go…
    from seeing all kinds of big muff schematics.. i decided to get adventurous
    and see if i could turn this into a big-big muff by adding 100k pots to the
    obvious areas on the board…
    I removed the jumper and resistor from the distortion area and added one
    and simply replaced the tone switch with a pot…

    so does that sound right?

    here are some ext. pics
    newLBM01.jpg
    newLBM03.jpg
    newLBM02.jpg

    in reply to: looking for 70s op-amp Little Big Muff EH1322 help #106718
    baeheezelmauth
    Participant

    alright, so using this pic, L to R jacks and lugs…
    dsc_0009.jpg

    correct me where im wrong…

    1-“INST” 1/4in in jack
    a- to “IN” pad on board
    b- to neg (-) batt lead
    c- to ground pad / 3rd pot-lug trace

    2- AC power jack (pos-inside, neg-outside)
    d- to “AC” pad on board
    e- to pos (+) batt lead

    3- “AMP” 1/4in out jack
    f- to stomp switch lug “i”

    and then
    -stomp switch..

    -single-lug side
    g- to trace leading to “OUT” on board

    -double-lug side
    h- to “IN” pad on board
    i- to “AMP” out jack lug “f”

    THANKS!!

    in reply to: looking for 70s op-amp Little Big Muff EH1322 help #106851
    baeheezelmauth
    Participant

    very good.

    and it looks like my stomp switch is missing a wire.
    it has one lug on one side going to a trace connected to the “out” pad on the board…
    and on the double-lug side of the stomp switch it has only one, going to the “amp” out-jack
    the other is missing…
    does that go to the final lug on the 1/4in input jack?

    THANKS!!!!

    in reply to: looking for 70s op-amp Little Big Muff EH1322 help #107098
    baeheezelmauth
    Participant

    nice! thanks-

    so- I’ve got that one… the “in” wire.

    and so the other 2 points on the 1/4in input jack.. are
    power switching?
    i am missing those too:(

    I can see where the center (+?) on the power input goes to the “AC” pad..
    where is that red (-?) going?

    are the red and black going to a battery lead?

    im grasping to figure this out for a friend… he is stoked at the
    chance to use this again after 14 ? years!

    thanks alot for your help!!

    in reply to: looking for 70s op-amp Little Big Muff EH1322 help #107396
    baeheezelmauth
    Participant

    so, I have found these pics that have helped a little…
    board-rear.jpg
    dsc_0009.jpg

    the first is just a hair away from working for me, but the all-white wire color scheme
    is a bit frustrating:)

    I think i now only need to see where all the input wires go.
    the bottom one would work if the wires were color coded or numbered…

Viewing 6 posts - 1 through 6 (of 6 total)