Correct- The 8 set screws are on the side. Round knob is used to rotor through the digital meter readout for each of the 8 tubes.Enjoy it. A great amp.
In case I was not clear the round knob is turned as you bias each KT88 with the 8 set screws so as to allow the digital readout for each individual tube.
It's heartwarming to know that in this digital age, the power of the press is not dead yet... I hope for some folks' sake that this amp is as good as Mr. Pearson says it is (this month).
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