Tube match problems


Hi Everybody

I’m new here and would like to ask for your help. 

I got VTL power amp with 6l6 tubes. They were perfectly match. Unfortunatelly when I was recently moving, took out tubes and forgot to mark tubes against sockets. Now I’ve connected back whole my set up, most luckily tubes in wrong sockets, it doesn’t play as it was. I don’t have tools to check bias and it really difficult to find any place dealing with tube amps in my city. Any ideas to solve this issue, which makes me crazy :(((
mn
All 6L6's will have the same value for biasing. You don't need to check serial numbers.
But check your tubes to see if they are 6L6, 6L6G, or 6L6GB.
Many thanks to All !!!
Very valuable advices and now I’m sure I’m gonna deal with that! 



Post removed 
Yea, I’m already aware of that. I don’t have a practice, but red lots of articles how to match tube/amp and relevant safety precautions.

Thanks.