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RE: A particular Marshall and "Voltage Doubling"

It was potentially a bit easier for them to source a transformer with the lower voltage windings.

Voltage doublers work nicely in a class A amp, but don't offer terrific regulation, so when you transition to class B, you'll get quite a bit of sag. (Maybe part of the design intention?)

Doublers also let you get away with lower radiated magnetic field from the power transformer.

As far as how the doubler works, there are a lot of articles online with neat little animations. If you connect what would be the ground lead of one of the supplies to the hot side of the other, then you have one high voltage supply.

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