I just picked up a real tube RTD model rt4002 and it doesn’t have a power supply. Only one I can find is one on eBay for $60. I was wondering if I can run it with a 24v power supply instead of the 30v. Or if someone knows where to find a aftermarket at a reasonable price. Any input would help my sanity since I have been searching for a solid day and haven’t found anything close other then a 24v. Thanks!!