Hey there! 

I just added a JCM 2000 DSL50 to the family and I'm now re-biasing it, as the previous owner set it to something strange like 30mV. 

I know, most sources in the www advice to bias it around 45mV, but I found it to sound best with one Tube at 39mV and the other one at 38mV.

When I set it higher the single notes in a chord (talking about the drive channel) tend to become "loose" and seem undefined. 

Is there anything that speaks against setting it to 39mV, could it be too low? 

I don't want to "miss" anything soundwise and just the fact that so many people advice to turn it up to 45mV makes me uncertain about my own ears.

Thanks! 

Kevin