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Bias consistently creeping up on one side

Posted by immatthewj on November 17, 2020 at 22:18:58:
Sorry, but I lack the ability to comprehend the basics of vacuum tube circuitry except that I know that I like the way tube gear sounds.
Anyway, this question pertains to a Cary V-12 with six EL34s on each side with two separate bias pots & a single power supply & it is drinking out of a dedicated circuit (with nothing else on it).
My listening sessions run for around two to five hours & I have taken to checking & adjusting my bias at the end of each session. I have noted that one side stays solid (@ about 260 mA + or - a couple) while the other side has usually climbed about 10 mA. I know that 10 mA is not a big number, but does the fact that this is happening consistently on one side indicate that one of the six EL34s on that side are going south?
Thanks.