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active biasing power transistors

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Can I use a circuit like this to bias larger transistors like "2sc2879" into class ab? A pair uses 200ma.

I know I can't run it constantly, but it would be on the relay only on transmission. The idea is to amplify a single side band transmission. The part I don't understand is, when under load will this change or stay pretty regulated? Thanks in advance. I hope I made since to some one.

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