downgrading filter caps, will it work?

priscared · 20th February 2004, 01:25 PM

Gday
I have a yamaha power amplifer. Problem is the filter caps need replacing. They are 22000uf($100each) These are a real pain. I was wondering if replacing these caps with 10000uf or even 8000uf would work. (100V) Any suggestions. ...
THanks All (anyone got any big caps to sell me?
Daniel

dmfraser · 20th February 2004, 04:11 PM

Yes, smaller caps will work. However, you will have poorer transient response, specially with lower frequencies. As well, the amplifier will clip at 1 to 2 db lower power than before. The amplifier will have poorer definition in the low frequencies. The term we have for it is "The bass sucks".

Basically, you will be converting a good amplifier into a cheap amplifier

UrSv · 20th February 2004, 04:13 PM

I'd maintain the 22.000 uF but choose something a little bit cheaper than AUD 100 caps.

KevinLee · 20th February 2004, 04:27 PM

Hello,

If you have the room you can parallel (2) 10,000uf caps to achieve 20,000uf. This is perfectly acceptable for what you are doing. Make sure the voltage rating is the same or higher than the originals.

KevinLee

GUILHERME · 20th February 2004, 05:17 PM

Hi.

If you mean replacing the 22000 uF by a single 10000 uF, then by lowering the capacity you're increasing the ripple on the rails. Just how much this will afect sound will depend on how the rest of the amp was designed, so unless you know what you're doing its a bit of a gamble. If you're really unlucky you could end up with a hi-power buzzing machine.

just my 2c.

Guilherme.

KevinLee · 20th February 2004, 05:28 PM

Maybe I was not clear,

You will replace (2) 22000uf caps with (4) 10000uf caps.

KevinLee

priscared · 21st February 2004, 07:08 AM

gday all
what im after is a cheaper solution than the $100 caps, Two 10000uf caps amount to over 100 anyway, so that wont work. just like four 5000 will amount to over 100. I just bought a new amp. and it has a 8700uf cap in it, it is very lacking on the bass. Its rated at 300w but that ********. I was quite annoyed by that. CYA
daniel

sreten · 21st February 2004, 09:20 AM

You need to pay attention to total ripple current ratings.

Its generally true multiple common value capacitors are
cheaper than one large unusual value capacitor.

You can achieve very high ripple current rating with
parrallel capacitors.

Try and obtain a batch of capacitors surplus with the right
voltage rating and parallel up as many as will fit in the space.

sreten.

20th February 2004, 01:25 PM	#1
priscared diyAudio Member Join Date: Dec 2003 Location: Victoria Australia	downgrading filter caps, will it work? Gday I have a yamaha power amplifer. Problem is the filter caps need replacing. They are 22000uf($100each) These are a real pain. I was wondering if replacing these caps with 10000uf or even 8000uf would work. (100V) Any suggestions. ... THanks All (anyone got any big caps to sell me? Daniel

20th February 2004, 04:11 PM	#2
dmfraser diyAudio Member Join Date: Dec 2003 Location: Orange County, CA	Caps Yes, smaller caps will work. However, you will have poorer transient response, specially with lower frequencies. As well, the amplifier will clip at 1 to 2 db lower power than before. The amplifier will have poorer definition in the low frequencies. The term we have for it is "The bass sucks". Basically, you will be converting a good amplifier into a cheap amplifier __________________ Dan Fraser

20th February 2004, 04:13 PM	#3
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	I'd maintain the 22.000 uF but choose something a little bit cheaper than AUD 100 caps. __________________ UrSv Those who say it can't be done should not stop those who are doing it.

21st February 2004, 07:08 AM	#7
priscared diyAudio Member Join Date: Dec 2003 Location: Victoria Australia	cheaper gday all what im after is a cheaper solution than the $100 caps, Two 10000uf caps amount to over 100 anyway, so that wont work. just like four 5000 will amount to over 100. I just bought a new amp. and it has a 8700uf cap in it, it is very lacking on the bass. Its rated at 300w but that ********. I was quite annoyed by that. CYA daniel

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20th February 2004, 04:27 PM	#4
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	Hello, If you have the room you can parallel (2) 10,000uf caps to achieve 20,000uf. This is perfectly acceptable for what you are doing. Make sure the voltage rating is the same or higher than the originals. KevinLee

20th February 2004, 05:17 PM	#5
GUILHERME diyAudio Member Join Date: Oct 2002 Location: PORTUGAL	Hi. If you mean replacing the 22000 uF by a single 10000 uF, then by lowering the capacity you're increasing the ripple on the rails. Just how much this will afect sound will depend on how the rest of the amp was designed, so unless you know what you're doing its a bit of a gamble. If you're really unlucky you could end up with a hi-power buzzing machine. just my 2c. Guilherme.

20th February 2004, 05:28 PM	#6
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	Maybe I was not clear, You will replace (2) 22000uf caps with (4) 10000uf caps. KevinLee

21st February 2004, 09:20 AM	#8
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	You need to pay attention to total ripple current ratings. Its generally true multiple common value capacitors are cheaper than one large unusual value capacitor. You can achieve very high ripple current rating with parrallel capacitors. Try and obtain a batch of capacitors surplus with the right voltage rating and parallel up as many as will fit in the space. sreten.

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