Blackgate C-type or Nichicon UPW/UHE for Input Caps

mudihan · 5th August 2006, 04:46 AM

Due to space limitation, I can only have electrolytic caps for input caps (4.7uf and up) in my amp. The Blackgate C-type seems to be the best choice, but I don't want to pay the $5 below-$25-order-fee most venders charge. Nichicon's UPW or UHE can be had for cheap at Mouser. How do they compare to the C-type? Thanks!

dodgerblue · 5th August 2006, 05:19 AM

there is the rubycon za 4.7 uf 35v at referenceaudiomods.com if you need

mudihan · 5th August 2006, 06:11 AM

Thanks! Your suggestion seems to exactly fit my bill.

By the way, the original cap value is 4.7uf. Is it ok (or even better) if i use 10uf caps? Thanks!

CBS240 · 5th August 2006, 09:28 PM

Generally the value is determined by input impedance and desired low frequency roll-off. f=1/(2*pi*Zin*C)

mudihan · 6th August 2006, 03:34 AM

Given a fixed input impedance and my desire to minimize bass-roll, a larger value is better, am I right? In my case, the input impedance is 22k ohm and the original cap value is 4.7uf. Expanding the value to 10uf would benefit the sound without much (if any?) side-effects, am I right? Thanks!

davidallancole · 6th August 2006, 05:45 PM

Please correct my if I am wrong.

I think I read this in one of Randy Slones books, it said something like having the roll-off frequency 10 decades below your lowest frequency expected to minimize the distortion caused by the capacitor.

So if you expect 16 Hz for a low frequency, your roll-off frequency would be .16 Hz. Which comes to a capacitor size of 45 uf.

This is probably not required from all the schematics I have seen. They usually have something like 4.7 to 10 uf and similar resistance.

5th August 2006, 04:46 AM	#1
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	Blackgate C-type or Nichicon UPW/UHE for Input Caps Due to space limitation, I can only have electrolytic caps for input caps (4.7uf and up) in my amp. The Blackgate C-type seems to be the best choice, but I don't want to pay the $5 below-$25-order-fee most venders charge. Nichicon's UPW or UHE can be had for cheap at Mouser. How do they compare to the C-type? Thanks!

5th August 2006, 09:28 PM	#4
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Generally the value is determined by input impedance and desired low frequency roll-off. f=1/(2piZin*C) __________________ All the trouble I've ever been in started out as fun......

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5th August 2006, 05:19 AM	#2
dodgerblue diyAudio Member Join Date: Oct 2005	there is the rubycon za 4.7 uf 35v at referenceaudiomods.com if you need

5th August 2006, 06:11 AM	#3
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	Thanks! Your suggestion seems to exactly fit my bill. By the way, the original cap value is 4.7uf. Is it ok (or even better) if i use 10uf caps? Thanks!

6th August 2006, 03:34 AM	#5
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	Given a fixed input impedance and my desire to minimize bass-roll, a larger value is better, am I right? In my case, the input impedance is 22k ohm and the original cap value is 4.7uf. Expanding the value to 10uf would benefit the sound without much (if any?) side-effects, am I right? Thanks!

6th August 2006, 05:45 PM	#6
davidallancole diyAudio Member Join Date: Nov 2005	Please correct my if I am wrong. I think I read this in one of Randy Slones books, it said something like having the roll-off frequency 10 decades below your lowest frequency expected to minimize the distortion caused by the capacitor. So if you expect 16 Hz for a low frequency, your roll-off frequency would be .16 Hz. Which comes to a capacitor size of 45 uf. This is probably not required from all the schematics I have seen. They usually have something like 4.7 to 10 uf and similar resistance.

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