WF2U wrote: (BC-375) > For the B+ you need 475 VDC and 1100 VDC (at about 350 ma), and 24VDC for > the filaments and relays. You're thinking of the ART-13. BC-375 needs only 24 VDC and 1000 VDC. It will run just fine on lower B+. 73 Dave S.