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RE: If you need precision current bias of power tubes...

"Current source my foot"

Which aspect of its performance caused you to say that? I do see that its output impedance isn't very high at elevated current settings. Not sure how parts like the LM317 compare in this regard. Most published specifications for the LM317 are based on use as a voltage regulator, not current source.

Buy Chinese. Bury freedom.

Edits: 06/04/17

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