input capacitor for a newbie

steven0356 · 26th November 2009, 12:57 AM

A buddy and I are doing a little experiment. We are building two gainclone amps. With his he is going cheep, and with mine I am trying to upgrade the components where it seems to make sense. We have almost everything figured out except which input capacitor to use for the upgraded amp. He is of the mind set that the input capacitor will not make much of a difference. To tell you the truth I don't know enough to have an opinion. I do know as I read through this forum about input capacitors there are some people that think strongly that these capacitor will make a difference.

So which input capacitor should I use. He estimates that I will need a capacitor 3 UF and 25 volts.

Thanks

Steve

Dxvideo · 26th November 2009, 07:34 AM

Whats your input load (Rb) resistor?
If its 20-22K then 4,7uF is enough. But a solid type capacitor (MKS, MKT, MKP) strongly recommended istead of electroytics.

wintermute · 26th November 2009, 11:56 AM

If possible go with a polypropylene cap. It will be big in comparison to electro's or polyester but they have much lower dielectric absorption which should result in better sound, especially when directly in the signal path.

I haven't tryed them myself but I've seen people say you can't beat the mudorf m-caps for value for money

Wima MKP-4 are quite a bit more expensive, but are not what would be regarded an audiophile cap... I personally use some no name polypropylenes in my amp

But for the best chance of hearing a difference make sure you friend uses cheap bi-polar electrolytics or polyester (greencap) caps as the input caps

Tony.

steven0356 · 29th November 2009, 04:25 PM

Thanks guys. this is what I love about this forum.

Sashi · 30th November 2009, 02:39 AM

Hey....I have some MPTA(Metallized polypropylene for AC applications) caps lying around. Can these be used instead of the regular MPT ones?

26th November 2009, 12:57 AM	#1
steven0356 diyAudio Member Join Date: Oct 2009 Location: Atlanta	input capacitor for a newbie A buddy and I are doing a little experiment. We are building two gainclone amps. With his he is going cheep, and with mine I am trying to upgrade the components where it seems to make sense. We have almost everything figured out except which input capacitor to use for the upgraded amp. He is of the mind set that the input capacitor will not make much of a difference. To tell you the truth I don't know enough to have an opinion. I do know as I read through this forum about input capacitors there are some people that think strongly that these capacitor will make a difference. So which input capacitor should I use. He estimates that I will need a capacitor 3 UF and 25 volts. Thanks Steve

26th November 2009, 07:34 AM	#2
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	Whats your input load (Rb) resistor? If its 20-22K then 4,7uF is enough. But a solid type capacitor (MKS, MKT, MKP) strongly recommended istead of electroytics. __________________ Best regards, Ozgur

26th November 2009, 11:56 AM	#3
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	If possible go with a polypropylene cap. It will be big in comparison to electro's or polyester but they have much lower dielectric absorption which should result in better sound, especially when directly in the signal path. I haven't tryed them myself but I've seen people say you can't beat the mudorf m-caps for value for money Wima MKP-4 are quite a bit more expensive, but are not what would be regarded an audiophile cap... I personally use some no name polypropylenes in my amp But for the best chance of hearing a difference make sure you friend uses cheap bi-polar electrolytics or polyester (greencap) caps as the input caps Tony. __________________ Any intelligence I may appear to have is purely artificial Some of my photos

30th November 2009, 02:39 AM	#5
Sashi diyAudio Member Join Date: Jan 2004 Location: India	Hey....I have some MPTA(Metallized polypropylene for AC applications) caps lying around. Can these be used instead of the regular MPT ones? __________________ Let There Be Music.

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29th November 2009, 04:25 PM	#4
steven0356 diyAudio Member Join Date: Oct 2009 Location: Atlanta	Thanks guys. this is what I love about this forum.

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