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CRC Filter ?
CRC Filter ?
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Old 31st July 2009, 04:48 AM   #1
kacernator is offline kacernator  Czech Republic
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Join Date: Jan 2008
Question CRC Filter ?


I have been experimenting with R value in CRC filter in my tube preamp. What I discovered that lower R values sound better to me than higher, although lower R has higher ripple.

Finally I settled on 220uF - 20 Ohm - 470uF. This filter hums a little, but I must put my ear right next to the speaker to hear it, so it is very quiet anyway.

With lower R in CRC the soundstage is much bigger, sound seems to be faster, better bass, better details, instruments are more separate from their self. Why is that? I thought that better ripple rejection the better sound?
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Old 31st July 2009, 10:09 AM   #2
diy4 is offline diy4
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Join Date: Jun 2004
Location: .
What was the original value of the resistor? Also, what were the DC voltages before, and after you changed the resistor?
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Old 31st July 2009, 10:15 AM   #3
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
what is the R of the transformer and wiring feeding the CRC?
You actually have an RCRC filter.
If you try adding a little extra R before the first C you may hear something else.
Even better, may be to replace part of the R with an air cored inductor (L+R). Adjust the fixed R values to give the desired (same) B+.

Do ensure that B+ is the same in all the implementations when making your sound quality assessments.
regards Andrew T.
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