Assertion: tube | /r/ObjectUse | used in emergency
Facets:
value: interchangeably
type: MANNER
Source sentences:
text: Other tubes, which in some cases can be used interchangeably in an emergency, include the 12AT7, 12AU7, 12AV7, 12AY7, and the low-voltage 12U7, plus many four-digit EIA series dual triodes.