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What Do You Hear When Your Amp Needs Biasing?

Hi, Everybody,

I was listening to my rig the other day and noticed that some (but not all) closely miked recordings of female singers (Diana Krall on some of the cuts on "When I Look in Your Eyes" comes to mind) sounded a bit edgy or harsh. I checked the bias on my Manley Mahi amplifiers and found that some of the values on the multimeter, which should have been at 250, were as low as 240. I made the bias adjustments and, lo and behold, the vocal tracks sounded better. So I'm wondering what, in general, is a tipoff that a to be of a fire needs to be biased?

Thanks!
rebbi

Showing 2 responses by rebbi

rebbi OP
1,326 posts
 
Minorl,

All Manley says in the Mahi manual is that the number should be 250. On average I've been checking them about every other month.
rebbi OP
1,326 posts
 
Lostbears,

Thanks for the post. What I was wondering is what the audible signs of a tube out of bias typically are.
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