The RCA 5876 is a UHF high-mu triode with a maximum frequency of 1000MHz and a maximum output of 5 watts. The most distinctive feature of the 5876 is it's unusual pencil triode form factor... the large disk in the center of the tube is the grid, and also serves as the grid's electrical connection. Two tiny pins on one end of the envelope provide connection to the tube's 6.3 volt heater filament. Suffice it to say, the socket for this tube is fairly complex. The 5876 was a relatively common tube produced by many manufacturers, and is readily available from most surplus suppliers.
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