When restoring a tube type radio, the restoration looks better when the tubes are nice and shiny. But cleaning tubes is hazardous to tube identification. The markings usually come off easier than the dirt.
What are recommended methods of cleaning tubes? Also, is there a method of reading the markings on tubes that have been smudged or with partially or totally removed markings? I seem to recall someone mentioning that the markings slightly etch the glass and there is a way to make the markings identifiable. Was I dreaming? If there is no way to identify an unmarked tube, what good is it? Dick KC9UB
