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
Contact VTL tell them the model no. of your amp. Ask how to check and adjust the output tubes' bias (milliamps). You will only need a multimeter and a screwdriver to do this. Be sure to have a load (speakers) connected when doing this! Otherwise damage to the amp will happen!
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! 



I'm kinda thinking the OP should be aware he's going to be sticking a screwdriver into a box with upwards of 500 volts inside.