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Old 31st August 2010, 12:42 AM   #81
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I whould put the device at the biginning of the chain, say behind a cartridge into the phonostage and then measure wideband noise over frequency.
 
Old 31st August 2010, 01:00 AM   #82
wwenze is offline wwenze  Singapore
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Quote:
Originally Posted by Joachim Gerhard View Post
I whould put the device at the biginning of the chain, say behind a cartridge into the phonostage and then measure wideband noise over frequency.
Good idea, if a decrease in noise from a phono source can't be heard then a decrease in noise from nothing can be heard.
 
Old 31st August 2010, 01:02 AM   #83
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That´s what i think. Maybe the device works only when a signal is present over it so aditionally i whould use a test record with a +12dB 1KHz sinewave.
 
Old 31st August 2010, 02:01 AM   #84
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What about just feeding a sine wave from a generator through it rather than using a test record? It's pretty easy to set up a dummy driving source impedance to match a phono cartridge, or even place a real cartridge in series with the generator output.
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Old 31st August 2010, 02:50 AM   #85
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I whould use a resistive divider then to make 0.1mV from 100mV for example. So 999 Ohm and 1 Ohm.
 
Old 31st August 2010, 02:52 AM   #86
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My idea with the cart was that "real world" argument, you know.
 
Old 31st August 2010, 02:53 AM   #87
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Another idea : shorting a low noise phonostage with a 0.25Ohm resistor and then with the bespoke device.
 
Old 31st August 2010, 02:57 AM   #88
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Understood, but noise spectra from records are... noisy. Noisy in the sense of having high variability and noisy enough to cover up phenomena.

Figure 2 of the His Master's Noise article shows the way I do attenuators for a balanced phono stage measurement. It might be interesting to do it that way, with and without the Bybees in each leg, then repeat the measurement with the input transformer bypassed, a larger signal source, and a source impedance of (say) 1k in series with 500mH to simulate an MM.

The DCR of the Bybee is supposed to be 0R025, so a 0R25 resistor will be noisier. Might as well short the input...
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Old 31st August 2010, 03:17 AM   #89
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what does it claim to do? Strip extraneous noise signals from a waveform without affecting the underlying carrier.

Test has to emulate that - a carrier signal (SYs sine for example) with a noise component embedded in the signal.

Further, since the claim is that there is a residual effect and the clean Bybeed signal continues through the following devices without picking up further noise, the test would need to measure at upstream nodes to identify whether that is the case.

Variations could look at pure and multiple frequency carriers as well as varied "noise" impressoins.
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Old 31st August 2010, 04:25 AM   #90
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A low distortion sine could be burried in white noise say at -30dB, by avaraging the sine is recovered and distortion measured, that is repeated with the Bybee in the chain. The sine could also be supressed digitally and then the noise analysed in both cases with and without the Bybee. My Praxis measurement system could do that. Instead of a sine a multitone signal could be used that resembles more music. Music can be used too as stimulus in the Praxis software.
 

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