Drip Pultec V1 - Problems in the bass

Hello guys!

Some years ago I built a Drip Pultec, the very 1st version. Right from the start I felt something was odd in the bass region, the curves sounded far off, but I learned to live with it. However It's time for maintenance and I think it's a good opportunity to fix it.

Does anyone have the original building docs of this version?

How does the expected bass curves/cuts of the pultec should look like in a pink noise measurement?

Thanks in advance and cheers!

http://www.uaudio.com/webzine/2004/july/text/content4.html

UAD modeled them so  these could be helpful too maybe.....

ruffrecords???