Reply To: Why +12V max? Home › Forums › QRP Transceivers › Why +12V max? › Reply To: Why +12V max? May 18, 2017 at 8:39 am #3517 W8AIMMember Does LNR monitor these posts??? I have a Tri-Bander, a dual-bander and a PFR-3B, all by Steve Weber and they all accept 13.8V no problem. I don’t think the MTRs are much different.