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Are you saying the foot controller has carbon brushes? If so, the carbon brushes are probably worn down so they are no longer making contact. You can try looking for replacement carbon brushes.
the speed is controlled by the foot peddle unless you have the knee lever type. if you have the knee lever there is a handle stored in the bentwood top plug it in the hole on the front of the case and it controls the resister under the panel at the far right of the machine case. although these work i usually wire around them as i prefer a foot speed controller
From ISMACS database it appears as a Class 18 which would be an industrial machine. Can you provide any further information to help with id'ing it.
Letter
Register Numbers
From - To
Machine Class
(Model No.)
Quantity Allotted
Date Allotted
Year Allotted
Notes
G-
746501
748000
18
1500
September 27
The AM series was made at Elizabethport NJ, between 1955 and 1959. This machine is one of a lot of 25,000 model 99s commissioned on 6 Sept 1956, but the actual date of manufacture is unknown; probably within a year of that commissioning date, though.
The 99 is a good little machine -- do you have the manual and parts lists?
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