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Re: Impedance of MP-1 phono section?

Posted by Ralph (M) on February 9, 2007 at 11:45:18

In Reply to: Impedance of MP-1 phono section? posted by Dave Garretson on February 8, 2007 at 09:58:23:

The MP-1 volume control is more like 250K.

The output impedance is not what is paramount- it is the value of the output coupling cap, which is set fairly low with the intention of preventing it from significantly messing with the sound (big caps do that).

A 100K volume control will work Ok if there are no other loads on the output of the phono section- it will cut off at about 3.5Hz.

When we experimented with opto-coupler technology, the results were not so good, but that was a few years ago. I'd be interested in your results.

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