This listing is for a vintage NOS (New Old stock) Sylvania type 5U4GB full-wave rectifier vacuum tube in the original box.

This tube tested great on a reliable Hickock 800A tube tester. 

The sections tested at 2850/2900 on a scale of 0-3000, where 1500 or more is "GOOD".   ...and NO shorts or gas detected.

Ref:  New tubes will typically test at 2600+/2600+ on this tester. This tube tested really strong and has very closely matched sections!

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