Home › Forums › Help/Technical Questions › Big Muff repair help wanted please

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  • September 14, 2010 at 6:07 am #80727
    cameronspg
    Participant

    Hi,

    I’m hoping the collective forum wisdom might be able to help me with some Big Muff fixing, please…

    After successfully fixing a non-operational Deluxe Big Muff (a dry solder joint, it turned out), I have cockily bought two “fixer” muffs off eBay ($162.50US for the pair, which seemed OKish) – a ’79 Op Amp (EH3003 circuit board) and an ’80 transistor (EH3034 circuit board), ages based on Pot dates, which I know is fraught.

    The op amp one is missing a capacitor which has been rather inelegantly yanked out. Can anyone tell me what value to replace it with? I have found an image of an opamp muff that looks the same and identified the one that’s missing (highlighted green)…

    The transistor one seems to have been mis-wired by someone in the past, as the tips of the input and output jacks don’t have wires that connect to them! Does anyone have good images of where the wires go from this circuit board, please?

    Also, what are people’s thoughts about trying to ‘preserve’ the original components in the repair, versus substituting switches for true bypass, new plugs etc? If I wanted to sell these muffs someday, does ‘modernizing’ decrease the value?

    Any thoughts greatly appreciated.

    thanks,
    Cameron
    Melbourne, Australia

    September 14, 2010 at 3:51 pm #111412
    cameronspg
    Participant

    Hi,

    not sure about posting etiquette; should this have been posted in the Vintage forum?

    thanks,
    Cameron

    September 16, 2010 at 11:16 pm #111450
    The EH Man
    Moderator

    The missing cap is a .1.

    As for the wires, the output jack wire goes to the footswitch. The input jack wire goes to the footswitch and there should be another wire from the input jack to the circuit board unless it’s been wired for true bypass.

    As for modernizing, switches and jacks wear out and need replaced. The last 2 triangle muffs I sold both had replaced jacks. Didn’t seem to hurt the resale any.

    September 17, 2010 at 3:57 am #111452
    cameronspg
    Participant

    Thanks so much EH Man,

    I will solder in a .1 capacitor into the op amp Muff and let you know what happens.

    With the transistor Muff, I think someone’s just wired it a bit wrong; there’s no wires going to the tip lug of the jacks, so they might have just got the lugs confused. Are there any diagrams of where the wires from the board are aupposed to go (ie where input/output/power connect)?

    thanks again for your help.

    Cameron

    July 14, 2013 at 2:29 am #119246
    osumosan
    Member

    Can someone tell me the values and type of the larger orange caps? Are they polarized and a good source. My v5 dropped one into the casing. I’ve soldered it back in but the posts were so short I’m afraid it’ll drop out again with any sort of nudging and want to have a spare cap around if I need to replace it.

    Thanks!

    Michael

    July 24, 2013 at 5:38 pm #119276
    osumosan
    Member

    Bump on getting info on those caps.

    Thx

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