Home › Forums › Help/Technical Questions › Vintage Polychorus power issues

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  • January 13, 2011 at 6:00 am #81224
    deemo
    Member

    Alrighty, so…

    I snagged a vintage Polychorus off of Kijiji for $10 because the guy said it was broken, blah blah blah. I figured I could fix it and even if not, $10 isn’t that bad of a loss. The power supply he gave me was 9v which obviously didn’t work, so I figured he was just using the wrong power supply (note: it turned it on, and still let most of the signal through)

    Then I hunted down one of the 24v EHX adapters but alas, the connector for the one I purchased is a Boss-style connection while my Polychorus has a 1/8″ jack for the power.

    What are my options here? I’ve scoured all over the internet for days and have attempted using a Boss to 1/8″ converter that came with my Godlyke Powerall but that didn’t work (didn’t even power it on).

    I’m currently worried about polarity and hope I haven’t fried the pedal or anything.

    Help me!

    p.s. *bonus question* I checked the pots and saw 13779xx (couldn’t really see the last two digits). I’m guessing that means the pots were produced in 1979, correct?

    January 13, 2011 at 8:11 am #113677
    melx
    Member

    I could be wrong on this but almost, if not all vintage EHX units in the large cases like the Polychorus has internal transformers and they had a power cord that plugged straight into the mains, so it sounds like someone’s been doing some modifications to me…. best take some pics and see if we can see what’s going on.

    and yeah 13779 means a CTS pot manufactured in 1979.

    January 13, 2011 at 10:59 am #113679
    The EH Man
    Moderator

    Some vintage units made for export did use an AC adapter, usually 24vdc.
    Best way to be safe is to look inside and see if there’s a transformer bolted on the side. If not, you’ll need to check the converter plug to see if it’s putting out a positive voltage on the tip of the plug.

    January 13, 2011 at 2:47 pm #113690
    deemo
    Member
    Quote:
    Some vintage units made for export did use an AC adapter, usually 24vdc.
    Best way to be safe is to look inside and see if there’s a transformer bolted on the side. If not, you’ll need to check the converter plug to see if it’s putting out a positive voltage on the tip of the plug.

    According to the Godlyke manual, the tip is positive on the converter. I guess I’ll have to go pick up a cheap multimeter to find out for sure.

    I’ll try and get some pictures up tonight of the insides of the pedal.

    January 14, 2011 at 5:22 pm #113747
    deemo
    Member

    Unfortunately this is the best picture I could take with my phone’s camera due to some issues with my camera at the moment.

    Just wondering at this point: would it be possible to modify the power jack to the more standard barrel jack?

    January 14, 2011 at 5:25 pm #113749
    The EH Man
    Moderator

    no pic showing up

    January 14, 2011 at 5:52 pm #113753
    deemo
    Member
    Quote:
    no pic showing up

    just edited the post. apparently it was too large of a file, should be there now

    January 14, 2011 at 6:00 pm #113754
    The EH Man
    Moderator

    You have a vintage model with the transformer removed. Replace the current power supply jack with the more standard one and get a 24vdc power supply.

    January 14, 2011 at 7:19 pm #113758
    deemo
    Member
    Quote:
    You have a vintage model with the transformer removed. Replace the current power supply jack with the more standard one and get a 24vdc power supply.

    thanks for the help! I really appreciate it.

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