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#6479
Graham
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There are two styles of 3 brush dynamo, early fixed 3rd brush and the later adjustable 3rd brush type. You can adjust output with the moveable 3rd brush style.

Check out https://www.bolsover.com/lucas/index.htm for good information on testing generators.

You can opt to discard the third brush and run the dynamo with a modern electronic field control.
Look in https://www.norbsa02.freeuk.com/goffyelectrex.htm for more details.