Best cheap preamp second Hand or DIY avaliable ?

[Chris Daly]

Check if your DAC has any DC offsets, if nothing, then as
simple an attenuator as possible, is what you need.

Cheers / Chris

 

[Eldam]

Thanks,

It has not DC offset, I trimmed it to zero volt (when dac chip is hot after around 10 to 20 minutes : TDA1541A)