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A Question About Volume Controls Types

My previous preamp's volume knob had a definite low point and high point. When it was powered down I could rotate the volume up to the maximum setting and if I left it there and switched the preamp on, it would of course come on at full volume.

I'm trying to understand how the volume control works on my McIntosh MA252 integrated amp. When it's turned off and I spin the volume control up, there's no end point; it just free wheels. After I've done that and I power it up, the volume is exactly where it was during my last listening session.

Can someone explain how they work so differently?
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Showing 4 responses by oddiofyl

oddiofyl's avatar
oddiofyl
3,450 posts
 
It most likely uses an optical encoder.  It could also use a sweep contact encoder ....
oddiofyl's avatar
oddiofyl
3,450 posts
 
I've always liked the tactile feel of a knob vs. push buttons ...  my last preamp had digial volume...I hated it and regretted selling my Mc C15 for that unit.

My c-j Classic 2SE has an analog pot, no remote which is fine by me.  My NAD M51 has a digital volume control, and honestly it is one of the best I have ever heard and is super smooth and has fi e increments, 100 steps.  

So it doesn't matter how its done as long as its done well.  
oddiofyl's avatar
oddiofyl
3,450 posts
 
That looks like a nice amp. How does it sound ? 
oddiofyl's avatar
oddiofyl
3,450 posts
 
The encoder translates the right or left motion into volume up or volume down to a microprocessor that manipulates the output either in the digital domain or often through a resistive ladder like in many Conrad Johnson preamps.  
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