Calling help for Lamm ML2.1 biasing!

I don’t know how to answer that question. The unit I have is configured for US voltage which follows a norm and it is within spec. I have an AC subsystem for the main system that is depicted in part in the system shown here under my name. If you are asking if variations in mains voltage would have an effect, I would have to believe so; ditto, noise or other nasties on the line will probably be revealed, especially using highly efficient speakers (104db/meter in my case) that are most suitable for this kind of amplifier.
If there is something technical you want to know, the best source is Vlad, who designed and built it. He is a nice man to talk to if you get the opportunity.
PS: to the extent you are asking about biasing, yes they interrelate. But, variations in voltage are rare; the current setting needs to be adjusted over time to address tube degradation.

Vlad urges that you buy a very high quality meter- a Fluke- which is spendy, but accurate. You should check the bias periodically and see if any settings have drifted. Also, Vlad burns in the "new" power tubes before sending to you but I usually wind back the current a little when replacing the big tubes and gradually feed them more signal via the preamp volume control over time, keeping an eye on the settings.
Some of this information-- like the requirement of a quality meter-- is on the owner’s page linked to above.
Enjoy your amps.

Thanks for the input and all these info helps to make sense now! 
So higher numbers makes the tube goes hotter as the max. value should not exceed 0.31dc. This has anyways been the way I calibrated too. I just got confused when I read from another post stating that when measuring plate current, less current will heat up the tubes. And some how with the ML2.1, the V2 pot it has 'Plate Current ' printed on! 

Here's the top of an ML2, which for these purposes, is probably identical to the ML2.1: 
https://thevinylpress.com/app/uploads/2018/08/lamm.jpg
I was trying to find something the other day and ran across a pile of literature from Lamm. In one piece, he talked about not letting the setting of plate current go higher than indicated at the risk of damaging the amp. 
If you have a question about the amps, there's really nobody better to talk to than Vlad. I would recommend an email to Lamm to set up a call, only b/c they typically don't take calls during the day. I think they also want the dealers to handle issues on the front line, but I've been dealing with Vlad and Elina a long time. 

ML2.1

Plate voltage
output stage tube
left of 6C33C is V1:
should read between 173,25V dc and 175V, dc max 175V dc

Plate current
output stage tube
left of 6C33C is V2:
should read between 0,30V dc and 0,31V dc, max 0,31V dc

Hopefully this is of some value.

https://lammindustries.com/pages/owners-page/

Well, I am a teach noob but all I needed to know is when I bias on the V2 position. Valves higher than 0.31VDC meant making the tube hotter? I just don't want to fry the amp. I guess many seasoned ML2.1 owners will know the answer.

Maybe you wanna re ask. Voltage never represents current.