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
Post removed 
Post removed 
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.