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I try to repair my EH Electric mistress Flanger please help

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  • I try to repair my EH Electric mistress Flanger please help

    Hello,
    I have an Elecrto harmonix electric mistress flanger. I put some of the components away, I don't remember why because I was young and did it now seems to me crazy that I did it.
    I want to make it works correctly.
    I find where to solder the input and output jack (I put the input and output jack away for another DIY project).
    Sound get out of the flanged output, but there is a shrill whistling. I set the 1K trim to have as less whistling as possible but it still is present.
    I'm not sure if I soldered every component, I'm using this schematic http://defigurheads.free.fr/emschem.gif because it is the closest to my Electric mistress (I really don't know which year mine is, there is written on the PCB "EH5150 C" do you have an idea if it is vintage or something?).
    Does one of you know the Electric mistress well and have an idea of where the whistling can com from ??
    The whistling change as soon as I move the "Range" setting.
    The sound of the flanger is strange it was not like this, the range seems to be very strange!!!
    Do you have an idea???
    Let there be rock http://fjgaston.free.fr
    Guitars : 1965 Gibson melody maker, 1969 gibson SG, 1985 Gibson Les Paul, 1957 FEnder Duo Sonic, 1963 Fender Musimaster, Fender strange stratocaster, Gretsch mod solidbody, "la blue" the strangest guitar ever made; Effect : Disto Blaster; Amp : 1973 Hiwatted Sound City 50 +, 1970 Sound city 120, 1958 Fender Champ, 1969 Carlsbro, 1970 Carlsbro, 1966 EKO, Home made amp.
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