Hello. Well first off I normally set bias at 120Vac input. The bias always shits around a bit and it depends on your DVM and how often it samples the voltage it's measuring. How much variation are we talking about? Remember you are measuring mV's, not volts. Also, the bias pots can be a bit touchy. I'm used to it...lol. BTW it's 2000 hours on the outputs so if you have exceeded that, it's time for a re-tube.
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