On 6/19/2014 1:24 PM, Robert Cham wrote:
> Take a close look at the sine wave distortion of your UPS. Many are not
> sine waves at all. Computers may not care, but analog electronics do.
> Responding to another thread, back in the '80s, Straight Wire Audio made
> a balanced phono preamp. It required rewiring your tonearm, but it was a
> godsend for radio stations whose studios were in high RF environments.
> Think about it, there are two wires for each channel on a phono pickup.
> One channels low is generally grounded. that;s usually a strap that can
> be removed. Then you can feed it into a balanced mic preamp, and all
> you have to deal with is the RIAA curve.
And, of course, loading -- moving-magnet cartridges usually want to see
a 47k load in parallel wih a certain amount of capacitance, not the
1.2-2.5k typical of mic preamps.
But yeah, if one is willing to rewire the tonearm, a balanced phono
input is eminently reasonable and a good idea.