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In Reply to: RE: Todd hears things most of us can't ;-) posted by AbeCollins on March 07, 2017 at 19:01:38
Digital noise, RF, radio stations, signals from space, ultrasonic echos from flying bats. You name it, Todd can hear it. ;-)
Does seem that way! I take a break listening when the ISS passes overhead. :)
Indeed the EAR is a simple three tube MM preamp with an added SUT stage for MC duty. The SP10, by contrast employs a single eight tube stage for all the gain. Adding a SUT doesn't bypass anything.
The current REF Phono 2 takes a similar approach using four 6H30 tubes and JFETs (similar approach to my SP20 but with more tubes). I prefer using a single stage optimized for higher gain.
There's not a lot measurements can tell us about what we hear but one certainty is that RF noise below the threshold of hearing for most of us is still noise. There's a lot of noise out there, just ask the guys and gals with the radio telescopes.
8X tube noise in a Phono gain stage?
Your MC amplified passively by a high quality SUT, then a Gas Tube regulated power supply and two stage, passive RIAA circuit, as god and RCA intended, is the way.
There's not a lot measurements can tell us about what we hear but one certainty is that RF noise below the threshold of hearing for most of us is still noise.
The Cable Simpletons still believe that LCR metrics fully evaluate all performance parameters. Except of course for audible effects caused by untrapped RFI/EMI!
I do take power and signal isolation pretty seriously. As Abe opined, however, one individual in particular takes this concern quite a bit further than others. :)
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