About: http://webisa.webdatacommons.org/144997621

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Yes, two heater power supplies is a pain, but so is exceeding a tube's maximum cathode-to-heater voltage, usually only 100Vdc.
http://www.w3.org/ns/prov#wasQuotedFrom	tubecad.com