Vacuum tube. | |||
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Vacuum tube. This is an Eimac 4-65A/8165 radio tube that contains a thoriated tungsten (i.e. radioactive) electrode. They are quite common actually, or at least used to be when vacuum tubes in general were common. Source: MDB Ventures Contributor: Theodore Gray Acquired: 7 August, 2004 Price: $30 Size: 3" Purity: 2% | |||
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