[LAU] DIY messurement-mic

I have a Panasonic W61 capsul here, famous for having flat frquency response. used for example in the Behringer C8000 (don't remember the correct model number) in fact it came in a cheap mic I bought only to have the capsul: http://www.leson.com.br/v1/produtos/microfones/index.php?pro_id=133&cat… problem is its an unbalanced circuit using a 1,5V baterie. I want to make it work balanced and with phantom power there is a famous project of a pre-amp circuit called P93: http://s1.postimage.org/5m4edvc6m/p93_f6.gif but since I have a preamp I'm asking myself if it wouldn't be sufficiant to use a t-power circuit. what would be the disatvantage? sure, it would come with less gain to the pre, but would that mean more/too-much noise? I have to say that i am no electrition, I have to find some-one to make this for me, so I want to keep it as simple and cheap as possible. I don't know if any of you guys can help me. Thanks Fabio T-POWER: pre mic 2 o---+---------------100uF------+-------o 2 + | | 3 o---)---+-----------100uF------)---+---o 3 - | | | | 1 1 | | 0 0 | | K K | | | | | | +---+---1K5--+----+--2K2---+ | | | | | 47u 10u Z 2 | | 9 K | | V 2 | | | | 1 o--+------------+----+------------+ PS: I have to add an english-spell-checker to my email-program lol.....excuse all the errors