General Electric UV-199 (isolated)
DC Det/Amp Triode
1925
This special tube has an overall height of 5 inches. One label states "July 2, 1925 Isolated Elements" and the other is marked RX-11. The internal structure is suspended by a single spring at the top, and 3 springs at the bottom. This was apparently an attempt to provide isolation from shocks and vibration.
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