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Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Amplifier Discussion => Topic started by: Jason G on February 26, 2007, 12:16:53 PM

Title: Power supply filter caps in opposite polarity ?
Post by: Jason G on February 26, 2007, 12:16:53 PM
Hello
I have a Legend 3OA amp with the problem most of these have which is humm. The last owner replaced the filter caps on the power supply and put them in with one cap - to ground and other + to ground. Which ever end is not hooked to ground is connected to the rectifier diodes. I though the last owner made a mistake and put them in like that but they took the time to draw arows indicating polarity. So I am scratching my head on this one.
Also does anyone know where I can get a schematic?
Title: Re: Power supply filter caps in opposite polarity ?
Post by: teemuk on February 26, 2007, 12:23:07 PM
Sounds like a dual supply (see http://sound.westhost.com/psu-wiring.htm figure 1). It should be allright.
Title: Re: Power supply filter caps in opposite polarity ?
Post by: Jason G on February 26, 2007, 12:42:59 PM
After looking at the schem that makes sense.
Thanks for the help!
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