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The Pearl Phono: Output cap?
The Pearl Phono: Output cap?
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Old 20th March 2007, 04:25 PM   #1
roger-k is offline roger-k  Norway
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Default The Pearl Phono: Output cap?

The ouput-cap in The Pearl Phono is 10u. Is it Ok to use another type capacitor. I want to use the same type as in the Aleph P 1.7.
Do you think this will affect the sound?
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Old 20th March 2007, 04:32 PM   #2
h_a is offline h_a  Europe
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You can use whatever you want as long as it's 10uF or larger.

Wether it affects the sound I can only say that everybody has his own opinion on this subject and people have very different opinions.

Cheers, Hannes
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Old 20th March 2007, 05:34 PM   #3
roger-k is offline roger-k  Norway
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OK. Thank you very much for the answer.
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Old 21st March 2007, 12:11 PM   #4
h_a is offline h_a  Europe
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Oh and don't forget it should be non-polarized!!

I guess you can also use electrolytics, but then you've to check the polarization of the dc first.

Cheers, Hannes
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Old 21st March 2007, 12:52 PM   #5
roger-k is offline roger-k  Norway
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Yes, I know it should be non-polarized.

I think I will use this:
http://www.elfa.se/elfa-bin/dyndok.p...htm?_65_471_29
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Old 4th June 2013, 02:11 PM   #6
ticktock is offline ticktock  Scotland
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Quote:
Originally Posted by h_a View Post
You can use whatever you want as long as it's 10uF or larger.

Wether it affects the sound I can only say that everybody has his own opinion on this subject and people have very different opinions.
Hannes, does it really need to be at least 10 F?
What if I go smaller, what if I go bigger than that?

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Old 4th June 2013, 03:01 PM   #7
cliffforrest is online now cliffforrest  United Kingdom
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The Pearl Phono: Output cap?
Quote:
Originally Posted by ticktock View Post
Hannes, does it really need to be at least 10 F?
What if I go smaller, what if I go bigger than that?

Calculate it. Z= 1/(2*pi*f*C)

The cap impedance impedance (Zc) forms a potential divider with the load impedance. As the frequency is lowered, Zc can become large enough to audibly affect the frequency and phase response.

Google a reactance calculator to get a feel for Zc at (say) 50Hz and see how this affects your load impedance (your amplifier Zin).
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Old 4th June 2013, 04:28 PM   #8
Michael Bean is offline Michael Bean  United States
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If I May...
Why do you want to replace the output cap? Is there something wrong with it? A coupling cap in that application will have little, if any influence on final sound if it is properly sized. A 10 uF cap into a 10k input impedance will give a 1.6 Hz roll-off frequency, which will keep any voltage drop across the cap to an extremely low value. If there is no voltage drop, there can be no influence on sound. (Woops - I better go put on my flame proof suit, I'm sure many here will disagree )
Substituting a lager value probably will give you nothing, a smaller value will raise the high pass frequency, which could possibly adversly affect sound.

Mike
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Old 4th June 2013, 05:06 PM   #9
BigE is offline BigE  Canada
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I see no reason for a phono section to have a response to 1.6 Hz. That enables woofer pumping

You may want to try this.....

Coupling Capacitor Calculator by V-Cap

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Old 4th June 2013, 05:11 PM   #10
Mr. dB is offline Mr. dB  United States
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Quote:
Originally Posted by BigE View Post
I see no reason for a phono section to have a response to 1.6 Hz. That enables woofer pumping
The LF response of the circuit is already limited by a small coupling cap between the gain stages.
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