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Conn 650 Capacitor Identification Please

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  • Conn 650 Capacitor Identification Please

    Hi everyone. I'm having a lot of trouble trying to solve a problem with the Fun-Master on my Conn 650 Type 1. I've solved several electronic faults, but this one has really got me stumped. This fault was there when I got the organ six years ago, but have not got around to tackling this one. Does anyone know what type of capacitors these pictures show. I'm thinking that if I need to replace any of these, I probably won't be able to get any original types, so I might have to buy modern ones. I know that there are different types for different jobs, but not knowing what these ones are makes it very difficult to order any new ones. I have found pictures of all of these on the Internet except the last one which I have included two images of, but no information as to what type they are. Any suggestions would be very helpful.

    Also, I am under the impression that the line on some of these capacitors to the left of the info indicates the negative lead, does anyone know if this is correct? Thanks guys.
    Attached Files

  • #2
    In order of the photos:
    1. Sprague Orange Drop - Polypropylene
    2. Mallory - Electrolytic. These from Mallory were junk. Replace
    3. Unbranded - Electrolytic
    4. Polystyrene
    5. Polystyrene.

    Of the above, the electrolytics are the most failure prone. I've had dozens of the Mallory type depicted fail. I'd replace them all.

    You can replace the electrolytics with virtually any brand electrolytic of the same value and voltage rating. I usually use Panasonic.

    You can find NOS Sprague Orange Drops online and they are now manufactured by Cornell-Dublier, CDE, but again virtually any polypropylene capacitor of same value and voltage rating will work.

    Polystyrene capacitors are no longer manufactured. You can substitute a metalized film capacitor of the same value and voltage rating. Polystyrene capacitors were typically used in tuning and other circuits requiring high temperature stability. I've never seen one that has failed, but if they were exposed to excessive heat and melted, their value will have changed permanently.

    Non-electrolytic capacitors are non-polarized and can be installed in either orientation. The line on these indicates the lead that is connected to the outside foil. If there's a choice, it's best to connect this end to ground, or the lower impedance side of the circuit, as it can reduce hum pickup; however, the construction of modern capacitors has changed and they may no longer have an outside foil and this marking. In that case, it makes absolutely no difference how you orient the leads.

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    • #3
      Thanks for the quick reply. Very helpful.