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I heard you the first time.

Or

I've heard you the first time.

I don't think you can use present perfect tense with 'first time'. Correct?
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I'd use simple past. "The first time" is a specific enough reference to make the present perfect inappropriate.
Comments  
In my opinion there's nothing to object against that.

I've heard you for the first time.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Anyone else have input on this topic?
 BarbaraPA's reply was promoted to an answer.