#1
i feel i should know since im changing tubes in my amp that is cathode biased. if i get all the same make and model does it matter if it isn't a matched set?
#2
Cathode biasing is when your amp doesn't need biased when you change power tubes, and IIRC I don't think buying a matched set is completely necessary, at least not with the pre-amp tubes.
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#3
http://en.wikipedia.org/wiki/Cathode_bias

thats cathode bias

matched sets arent necessary, some people like unmatched tubes, some like to match them. thats a tonal preference, technically a matched set should be ideal, because both tubes work at an almost identical workload, they wear evenly. some say that having 2 technically identical tubes isnt as harmonically rich as having a little mismatch...

i buy matched sets, from groove tubes, but just know that it isnt a requirement.
im a blues man, but a good man, understand?