Trimming DC Offset on Nico's preamp

[gmphadte]

I have assembled this preamp(link below) with the intention of capacitor-less coupling. One of the channels is having -6mV and the other shows -16mVdc approx. The complementary matching of these BD139-16 n BD140-16 from the twenty each I purchased was impossible and I want the offset to be as low as possible. Is there any changes in resistors/or addition of preset I can incorporate so that I can trim the offset.

http://www.diyaudio.com/forums/pass-labs/91617-low-distortion-high-dynamic-range-pre-amp.html

Help needed

Gajanan Phadte

 

[lineup]

6 and 16 mV is very good.
No need to have less DC-offset

 

[jerluwoo]

You can replace R5 or R6 with a trim pot.

 

[gmphadte]

I tried to trim one of R3/R4, but I did not like the way it(DC offset) drifts.

My worry is that if I connect this directly to my power amp, it will have big DC at the output.

Gajanan Phadte