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TKsys 20th March 2007 12:03 PM

Impedance correction for old Fe103 (zobel)
Hi Folks,

I'm looking for a zobel network to compensate the rising impedance of my old Fe103 (without "e"). Has anyone values for C an R for me?

I use the driver with my wimpy tube amp and without compensation the treble is way to prominent.

BTW: search function got no answer for me.


gmilitano 20th March 2007 05:47 PM

Here are most of the tools and information you will need:


Calculator (.XLS):

FE103 Datasheet:

Unfortunately, the datasheet does not give Le, which you will require to calculate the Zobel.

Perhaps someone who has a FE103 can offer up the inductance.


EC8010 20th March 2007 06:09 PM

10R in series with 3u53 works for the FE103E. That should be a good starting point for the old FE103.

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