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tony Ma 9th March 2013 08:58 PM

Lower value Cap
 
Dear All,

Sorry for a newbee questions

I like to know what you guys think with this "upgrade" scenario

Let's just say originally the Tube Pre-AMP has a 1UF capacitor

Can we substitute with some thing close to the original value such as .82UF ?

Is there any sound different?

I knew that the voltage must be the same

Let me know your insight guys

tks

Robert Kesh 9th March 2013 09:14 PM

Quote:

Originally Posted by tony Ma (Post 3403406)
Dear All,

Sorry for a newbee questions

I like to know what you guys think with this "upgrade" scenario

Let's just say originally the Tube Pre-AMP has a 1UF capacitor

Can we substitute with some thing close to the original value such as .82UF ?

Is there any sound different?

I knew that the voltage must be the same

Let me know your insight guys

tks

Probably be fine. Caps are often +/-20% or more their nominal value, so it's just possible your lower value cap is actually higher value. Circuit may have been designed for a lower cap and rounded up to nearest standard value of 1uF. Hard to tell without schematic. And why the upgrade?

tony Ma 9th March 2013 09:24 PM

Well there is a leak on the capacitor that is the main reason upgrade / change

Robert Kesh 9th March 2013 09:34 PM

Quote:

Originally Posted by tony Ma (Post 3403443)
Well there is a leak on the capacitor that is the main reason upgrade / change

Well, like I say, cap type and schematic is really necessary to be sure.

tony Ma 9th March 2013 09:44 PM

Quote:

Originally Posted by Robert Kesh (Post 3403455)
Well, like I say, cap type and schematic is really necessary to be sure.

Hmmm I don't have the schematic

It is just in Pre-amp and the original is WIMA MK (film capacitor right?)

Robert Kesh 10th March 2013 01:04 PM

Quote:

Originally Posted by tony Ma (Post 3403464)
Hmmm I don't have the schematic

It is just in Pre-amp and the original is WIMA MK (film capacitor right?)

What kind of preamp? If it's just a coupling cap, then some leeway may have been designed in. So a -3dB at 5 Hz becomes a -3dB at 6.1dB and nothing is lost. But if it's, say, a phono preamp, and the cap is part of the equalisation, then the tone will change, although probably not by much.

AndrewT 10th March 2013 01:07 PM

Wima MK don't leak significantly, at least with the equipment that you probably have at hand.


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