 As the Loewe set had only one valveholder, it was able to substantially undercut the competition.The resultant radio receiver required a 90 volt HT plus a 4 volt LT (A and B) battery (the HT battery provided not only 82.5 volts for the HT, but also two grid bias supplies at −1.5 volts and −7.5 volts).One major disadvantage of the 3NF was that if one filament failed, the whole device was rendered useless.