No, at standard B&W it just would mean a little bit longer exposure time, and if you would use contrast variable paper, a slightly different setting. But the mains voltage has similar effect, and as you do not work along a certain standard, but to your very own it does not matter anyway. At colour printing you would have to calibrate your filtering to any enlarger anway, and you would not use this enlarger for colour printing either, too clumsy in filtering to modern standard.
Any filtering (including for contrast variable papers) must be done under the lens, as your enlarger does not have a filter drawer above the film stage. But there are filters and holders for beneath the lens.