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You will need the NV73 mic pre too. This addon EQ follows the same circuitry as the original and so the EQ circuit is in between the input amps and the output amps of the mic pre. To make it standalone, you would need to add other amp stages and it would take it away from the classic vintage circuitry.

Don't panic! Have a look again over your work. Look at the manual. Have a look on www.groupdiy.com at the support thread. This is a great forum specifically for audio- minded solderers! Take comfort in the fact that there's definitely a specific reason why it's not working... it's just about finding it! Definitely no magic or voodoo making it not work! No matter how much it feels like it!