F5 power amplifier

F5 needs gain.
the F5 has gain.
It's maximum output is ~22Vpk.
It's maximum input is ~3.8Vpk. This is equivalent to 2.7Vac.
The F5 does not need more gain.
Low output sources may need more gain, using a low gain amplifier rather than a unity gain buffer.

But what is the point. You are using a damaged sound card and complaining it does not give enough volume and that is starts to distort after a short while.

Maybe the F5 and your source are compatible if you get the damaged sound card replaced or repaired.
 
the F5 has gain.
It's maximum output is ~22Vpk.
It's maximum input is ~3.8Vpk. This is equivalent to 2.7Vac.
The F5 does not need more gain.
Low output sources may need more gain, using a low gain amplifier rather than a unity gain buffer.

But what is the point. You are using a damaged sound card and complaining it does not give enough volume and that is starts to distort after a short while.

Maybe the F5 and your source are compatible if you get the damaged sound card replaced or repaired.

I bridged the sound cards low quality 47uf caps.emu1212m users said these caps are not very necessary.And sound really very improved.But after 2-3 hours it gets distorted.When i restart the computer it is ok then.I did not understand