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If you pull the HOT and damper, then no need to pull the 1B3, as it won't be seeing any plate or filament voltage.
But as you say, this will take a significant load off of the B+. This will increase voltages throughout the rest of the set, and will kill the boost voltage, which is needed in some sets to run things like vertical sweep.
When doing an alignment or other critical adjustments, you want the set in as close to a normal operating condition as possible. The least "invasive" way to disable HV is just to disconnect the 1B3 plate cap.
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