Best 5814a tubes for DAC?


What are the best 5815a tubes for use in a DAC? CBS/Hytron are well regarded, How do the Raytheon compare?
pmboyd
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Thanks for your responses. Does anyone care to comment on sound character of any of the various 5814a? For use in a DAC, I'm looking for the greatest detail, balance and accurate tonality. Maximal information is the key here; I can "tune" with the tubes in my preamp.