The bridged monobloc Kaiju feeds the single input to both tubes, whose outputs are then wired in series so the voltages add. Both channels get the same signal at the same time from the same source. The main reason is that the tubes do not interfere with each other even if they are not matched. (Well, OK, there is a bit of effect, but it's ten times less than with paralleled tubes.) None of our amps have a critical need for matching.
This applies to Stereomour, S.E.X., and Seductor as well.