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These were used in Radios. See the yellowed tape in the third photo? Someone tested this many years ago with the appropriate machine and marked this as "good". I have no machine, so I can only say this is a beautiful sculptural object. It looks as if Superman's Fortress of Solitude is inside. Mercurized glass at the bottom. So cool. I could date it to the year as there is a Museum in Vancouver that has one of these.

As with all glass that I ship this will be sent double boxed. I have't added insurance, though, so If you would like it insured please let me know before purchase, that will add $1.85 to the cost.

Vintage 1940 RCA vacuum tube 6A3


  • Vintage item from the 1940s
  • Material: vintage radio tube
  • Only ships within United States.
  • Feedback: 555 reviews
  • Favorited by: 28 people