904b setup info ?

Does any information exist regarding the setup and calibration of the 904b High Pass Filter ? There seems to be no mention anywhere …
or at least none that I can find.

You can find some rough points concerning setup / calibration of my 904B clone on my web page where I describe the issues I considered as useful. But no precise calibration infos, sorry. See here:

http://www.analog-monster.de/mmt904b_en.html

Thanks for this link…it will certainly help me sort my miss-behaving 904B
PS Great site !