Home › Forums › Vintage EHX › Best way to convert 18V electric mistress to 9V…?

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  • June 23, 2010 at 2:15 am #80395
    tj0007
    Member

    Want to ensure I go about having my 1970’s 18V electric mistress flanger converted to 9V the right way, otherwise it could get a volume drop (and it already has one!), the effect might be half as pronounced or the effect might not work at all.

    Is the best way around this to install a voltage doubler inside the pedal? ie Hit it with 9v, through the chargepump and out comes 18v….
    Any other suggestions…?

    I intend to have the existing volume drop fixed. the old ‘mistresses all have a terrible volume drop when the effect is on. i can’t find an internal trimpot to adjust this, the two pots i can adjust change the modulation of the effect, not volume. Otherwise the volume could be replaced with a new one of the same value, or a larger value.
    What about putting another resistor in series – with the volume pot could open the pedal up volume wise. I am wary of having a boost circuit installed as i don’t want the tone of the effect changed.

    I have posted at diystompboxes as well.

    June 23, 2010 at 9:44 am #109745
    Dreamhunter
    Member

    I saw this today, maybe it helps, it mentions a mod for the volume drop, i hope it helps:

    http://www.youtube.com/watch?v=4XqEeJbHcXg

    I am also looking for a fix for the volume drop on my 80’s Deluxe Electric Mistress.

    June 23, 2010 at 6:18 pm #109761
    julian
    Moderator

    A charge pump to 18v was the first thing

    electroharmonixelectricmistress.gif

    Notice it regulates down to 12V. According to tonepad powering it with 9v instead of 12v shouldn’t make a huge difference. http://tonepad.com/project.asp?id=54 So you could remove the regulator circuit and power it with 9v.

    I found some more stuff at DIY Stompboxes:
    http://www.diystompboxes.com/smfforum/index.php?topic=85331.msg713216;topicseen

    and a discussion about raising 9v to 12v here:
    http://www.diystompboxes.com/smfforum/index.php?topic=78128.msg642883

    DIYstompboxes is a great resource, I suggest you get an account! :)

    June 23, 2010 at 10:13 pm #109767
    tj0007
    Member

    thanks – see above where i stated “I have posted at diystompboxes as well.”
    that first diy post is actually mine!
    :)

    June 24, 2010 at 4:24 pm #109779
    Fender&EHX4ever
    Moderator
    Quote:
    Want to ensure I go about having my 1970’s 18V electric mistress flanger converted to 9V the right way, otherwise it could get a volume drop (and it already has one!), the effect might be half as pronounced or the effect might not work at all.

    Is the best way around this to install a voltage doubler inside the pedal? ie Hit it with 9v, through the chargepump and out comes 18v….
    Any other suggestions…?

    I intend to have the existing volume drop fixed. the old ‘mistresses all have a terrible volume drop when the effect is on. i can’t find an internal trimpot to adjust this, the two pots i can adjust change the modulation of the effect, not volume. Otherwise the volume could be replaced with a new one of the same value, or a larger value.
    What about putting another resistor in series – with the volume pot could open the pedal up volume wise. I am wary of having a boost circuit installed as i don’t want the tone of the effect changed.

    I have posted at diystompboxes as well.

    There are 9v versions of the vintage Electric Mistress still floating around on eBay. Howard Davis reworked the circuit in the late 70s. I used to have one, and I regret selling it. It’s volume drop was less pronounced, and it sounded great.

    Here’s a clip of it: http://soundclick.com/share?songid=7095553

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