I would contact Decware directly to get accurate information about the tube biasing.
From the owners manual:
YOU MUST SET BIAS EVERY TIME YOU CHANGE THE OUTPUT TUBES. Output tubes should always be purchased and changed in matched quads ONLY. Do not run matched pairs in the amplifier, only run matched quads. Alternate tubes may be used in this amplifier such as 6L6, KT77, KT66, 7027. All of these tubes however will require considerable adjustment to the bias screw when compared to EL34. !When the amplifier is biased properly, you may turn it off and re-install the input tubes.
BTW, If you’re new to biasing tube amplifiers, you may not realize that many tube amplifiers require you to repeat this process for EACH output tube and will have 4 bias adjustment screws. This might seem cool at first, however once you have the first tube set to where you want it, it changes as you adjust the second tube at which point you’ll have to re-adjust the setting for the first tube, and then re-adjust the second tube again... you get the idea. In the TORII JR, all 4 tubes will bias exactly the same provided you have a matched quad, so setting the bias typically takes under 1 minute.