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    Effects of increased Capacitor voltage

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    scsidude2

    Posts: 21
    Join date: 2010-03-19
    Age: 27
    Location: Dekalb, IL

    Effects of increased Capacitor voltage

    Post by scsidude2 on Fri Jun 11, 2010 3:50 pm

    Here's a general amp question. What is the effect of replacing a capacitor with one with a greatly increased voltage rating? I ask because i'm in the process of repairing an amp and wanted to replace the 330pF caps but there was no voltage rating, i ended up using 600v replacements but am now having problems with both channels operating at full power.

    Bob Latino
    Admin

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    Join date: 2008-11-26
    Location: Massachusetts

    Re: Effects of increased Capacitor voltage

    Post by Bob Latino on Fri Jun 11, 2010 6:18 pm

    scsidude2 wrote:Here's a general amp question. What is the effect of replacing a capacitor with one with a greatly increased voltage rating? I ask because i'm in the process of repairing an amp and wanted to replace the 330pF caps but there was no voltage rating, i ended up using 600v replacements but am now having problems with both channels operating at full power.

    Could you let us know what type of amp this is and how the capacitor is used in the circuit?

    Bob

    scsidude2

    Posts: 21
    Join date: 2010-03-19
    Age: 27
    Location: Dekalb, IL

    Re: Effects of increased Capacitor voltage

    Post by scsidude2 on Sat Jun 12, 2010 1:57 pm

    Its a solid state 2 channel Son of Ampzilla. I know this is a Dynaco forum so i tried not to get into specifics about the amp and just keep it a general question. Here's a picture of the board, all caps in question are on the input board, none are on the bottom output board. There are 8 caps altogether that were replaced without knowing they're voltage, they're the two 330pF in the middle bottom, 2 10pF caps in the middle top, 2 22pF on the far sides of board, and the .001uF caps just below and to the inside of the 22pF caps. This picture is of the board prior to replacing the caps.

    scsidude2

    Posts: 21
    Join date: 2010-03-19
    Age: 27
    Location: Dekalb, IL

    Re: Effects of increased Capacitor voltage

    Post by scsidude2 on Sat Jun 12, 2010 1:57 pm

    Woops, forgot to include the link to the picture. Thanks again.
    http://www.servimg.com/image_preview.php?i=4&u=15098520

    Bob Latino
    Admin

    Posts: 1881
    Join date: 2008-11-26
    Location: Massachusetts

    Re: Effects of increased Capacitor voltage

    Post by Bob Latino on Sat Jun 12, 2010 2:47 pm

    scsidude2 wrote:Woops, forgot to include the link to the picture. Thanks again.
    http://www.servimg.com/image_preview.php?i=4&u=15098520

    Hi,

    From looking at the schematic a 500 volt rated cap should be more than enough. For small value caps in the pF range I like to use silver mica caps which do come rated at 500 volts.

    Bob

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