EC900 for Headphone amplifiers

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My idea is to supply all with 12V lead battery with a self oscillating stage for H.T.
Because I do not trust myself of mains supply especially with in-ear headphone :hphones:

I have found in my old-stuff these tubes : EC900 ,6AF4A,
Can I use them ? or is better a classic ECC82/3/8 ? :dead:
 

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