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Bias on solid state?

My amp has just been serviced - an MF NuVista M3 integrated - and among other things the tech said that he biased the amp. I've heard of biasing tube amps, but this is a solid state amp section with tubes only in the pre. I have heard references to bias on SS A/AB amps, of which this is one.

Can anyone explain what all this means? I'm clueless on it.
grimace

Showing 2 responses by bdgregory

bdgregory
1,721 posts
 
also, the Nuvistor is actually a tube, not a transistor.
bdgregory
1,721 posts
 
right you are Grimace . . . I neglected to engage my brain before that post.

As for your question - there may be more authoritative responders, but it does affect sound, and also determines class of operation. For example, by B&K M200s are biased to deliver 10 watts in Class A. The bias can be set to deliver more or less class A power.
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