The Amp Garage

hi guys, I'm decided to build this but I can't found 588-RJS150E RJS150E Ohmite Power Rheostats 50watts 150OHMS on stock, so I wonder If it can be replace for this one Rheostats 50watt 125ohm 750V Std Shaft which is the same but 25ohm less, so the questions are; do I need to use a sitch with a large...