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Old 26th June 2003, 05:04 PM   #1
SBIRO is offline SBIRO  United States
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Default dynaco pas3 power supply

Hi guys, I am looking for a schematic to replace the power supply on my pas3, I heard this was the weak point for this preamp.
I have already looked at curcio web page and his PS looks simple
but is little expensive.
I was hoping anybody has somethig I can build myself, even if I have to change the trans.
Thank you.
Pat.
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Old 26th June 2003, 06:14 PM   #2
Joel is offline Joel  United States
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What are the specs of your Dyncao with the stock power supply?
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Old 26th June 2003, 06:19 PM   #3
SY is offline SY  United States
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Change the transformer. The stock one is weedy and unreliable (yes, I know, there's at least two versions). Go to solid state rectification; high speed diodes are cheap. Replace the original filter caps with something newer and bigger. Replace the selenium rectifiers with silicon and replace the voltage doubler electrolytics, again with something newer and bigger. Then you can think about regulating. I've had very good experience with Curcio's regulator designs.
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