Phono Box DS3 B output impedance

I can’t find it, either, but assuming you own the all solid state DS3B, the output impedance ought to be very low, in the range of 100 ohms give or take, which means it can drive any linestage you’d care to use. Is there some reason you need to know exactly?

Thanks for your thoughts about that. Yes it's the SS Phono Box (not the Tube Box).

I'm using an E1DA Cosmos ADC Iso to rip LPs. A cheap little device made for measurements but many people use it to rip audio.

You can set the input range / impedance with a dip switch; mine is set on 4,5 Vrms / 1,66 kOhms. Input sensitivity is matching very well with the gain of my Phono Box but input impedance may be too low (though I didn't notice any trouble such as voltage drop or distortion), depending on whether or not the output impedance is high. 

Hence my question about output impedance. I was only able to find the output impedance of the Phono Box RS, which is of 50 Ohms.

If it's 1.66K ohms input Z, then you are probably OK, but I don't blame you for wanting to be sure, because unless the output Z of the DS3B is under 200 ohms, the ratio of output Z to input Z might be a shade lower than 1:10.  On the other hand, if the ratio IS only a little below 1:10, I doubt you would hear a problem. You suggest above that you can adjust input Z; can you raise it a bit?