06-11-2016, 12:15 PM
The simplest check is, put the ohmmeter across the AC plug, while Off. Turn it on. The resistance should be on the order of a few hundred ohms or less . If very high (Kohms, Mohms), your filaments are open or the tube sockets do not make good contact.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.