The porosity of the carbon coating is useful when the tube is used under circumstances where secondary emission from this electrode may be harmful. It is believed the secondary electrons are trapped in the porous labyrinth. Also, the porosity is necessary to facilitate de-gassing this electrode during the manufacturing process. It is generally more difficult to process cathodes with this type of sleeve, but exhaustive tests indicate a much greater stability than with the nickel alloy cathode sleeves commonly used in electron tubes, The 5881 carries ratings similar to the 6L6, except that the allowable screen dissipation is 3.0 watts instead of 2,5 watts while the maximum plate dissipation is 23 watts instead of 19 watts for the 6L6. The tube has a low loss micanol base.
Preliminary tests give results, which augur well for the future of the type.
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