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Old 31st July 2009, 04:48 AM   #1
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Question CRC Filter ?

Hi,

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
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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
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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.
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