Passive and Tube EQ Theory

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drask

Well-known member
Joined
Oct 3, 2010
Messages
228
Hello,

I'm looking after Passive / Tube EQ Theory.
If somebody have website, book or anything, I'm interested.
I've always :
http://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html
http://home.online.no/~jaeioluf/sound/eqpassiv.htm

But if some one have more, it's will be great.
I try to make a "full paramatric" passive EQ.
I've read it's not possible to have a perfect full parametric EQ like un active EQ (about Q) but I've use some passive EQ with a Q (relative Q is it?)

So, thank's you at all who can help me.
Regards
 
There is no one tidy place that contains all that info.  Start reading here and you will find great information.

One question - why does it need to be passive?  For fully parametric active is really the only option.  Though now very skilled I've given a lot of thought to the passive eq concept.
 
Good thank's, maybe a topic in preference?

It need to be passive only for my knowledge in passive EQ. And trying to build a one band full parametric passive EQ.
I'm really interested in the design of passive /tube EQ.
And I would like to build one for make some experimentation.
 
http://www.forsselltech.com/media/attachments/Evolution_of_an_EQ_Design2.pdf

I've been studying the forssell and NYD designs off and on recently, I don't have a specific project in mind I just enjoy the math.

These are great too...
http://home.online.no/~jaeioluf/sound/eqpassiv.htm
http://awasteofsalt.com/gyrator/
http://www.groupdiy.com/index.php?topic=411&start=0&postdays=0&postorder=asc&highlight=
http://www.ethanwiner.com/filters.html

 

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