For those who are interested in playing with their Analog Delay filter curves

[Dirk_Hendrik]

Since I needed them anyway earlier today I traced the filters of my Ibanez AD-9. Since the filtering in a delay makes up for most of the sound it can be attractive to apply the component values of the filters to other designs like for instance the PT-80. Have fun.

http://www.dirk-hendrik.com/ad9-filters.pdf

[Dirk_Hendrik]

Wow,
66 vieuws, 29 downloads and 0 response. Too difficult.

[$uperpuma]

I'm not even smart enough to know what I'm looking at... but it makes me want to get an ad-9 even more...

[tommy.genes]

Wow,
66 vieuws, 29 downloads and 0 response. Too difficult.

I, for one, downloaded and saved it for future use. I don't have the time to review it thoroughly right now (I'm at work - shhh! -  ) nor am I familiar enough with filter design to enter an ongoing discussion right now, but I do appreciate the effort.

-- T. G. --

[Kornell]

Thanks 

[Mark Hammer]

Note the two complementary op-amp circuits.  The use of the parallel RC network on the input stage, and the parallel network in the feedback loop of the output stage, attempt to produce a "poor man's Dolby" by boosting the treble on input, and de-emphasizing it on output.  A great many commercial BBD pedals utilize this strategy, most often when they lack companding.