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=== Hum ===
This controls the AC ripple plate voltage, which affects how the power tubes behave. For some amp models, this control has little effect; for others, it can be dramatic. It's hard to describe, and it varies from amp to amp. Also, the changes in tone are not completely linear. IE - if you find it to sound warm at 50% and cold at 25%, it's not necessarily going to sound really cold at 0% or really hot at 100%. ''Be warned: this control can cause weird things to happen to your tone when you move it off 50%. '' For instance, I liked the tone when I turned it up from 50 to 70% on the Uber model but noticed it introduced a faint, kind of digital-sounding ghost signal doubling my guitar parts. I almost always leave this control at 50%.
The big exception is the Uber model. I find a touch more Hum (55-60%) changes the distortion to thicken it up a little and make the overall tone a bit darker, which I really like. I also find setting it around 75% gives me a more evil tone, which I use to approximate a 5150. I have not had such luck manipulating this control on other amp models.