Lower value Cap

tony Ma

Member
2011-02-25 10:06 pm
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

Member
2012-10-28 3:20 pm
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?
 

Robert Kesh

Member
2012-10-28 3:20 pm
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.