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-   -   IFR513 headphone amp channel mismatch (http://www.diyaudio.com/forums/headphone-systems/144413-ifr513-headphone-amp-channel-mismatch.html)

zebra100 19th May 2009 08:31 PM

IFR513 headphone amp channel mismatch
 
Hi,

I have a headphone amp based on the IFR513 MOSFET which has a noticeable volume difference between the L + R channel outputs. All the resistors have been checked and measured to ensure a close match. All things being equal, could one or both of the MOSFET's be at fault?

Also, do MOSFET's of the same type differ greatly in output?

Regards,

Chris.

zebra100 20th May 2009 03:10 PM

Any ideas?

I have the amp in bits at the moment (re-wiring the passive pre side of it). Is it worth ordering some more MOSFETS, or would it be worth adding trim pots in the bias cct?

Many thanks,

Chris


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