Seems like they have all they need to operate. The item "Pair of Vintage Gates Equalized Preamplifier Model M6244 RCA Altec WE" is in sale since Monday, March 8, 2021.
This item is in the category "Consumer Electronics\TV, Video & Home Audio\TV, Video & Audio Parts\Record Player, Turntable Parts". The seller is "middlemansalesandauctions" and is located in Monticello, New York. This item can be shipped to United States.