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Old 2nd June 2008, 10:13 PM   #1
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Default nad phono stage

hi i have an old nad 3020 that im currently restoring, it was in very bad shape, its all going well appart from the phono stage when i apply a sinewave to it, it turns it into a square wave, having not really dealt with phonostages before i was wondering if this was correct because the trace on my friends oscilloscope is the same for left and right at the pre-amp output, its just that its a square wave!

any help would be appreciated

thanks
chris
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Old 2nd June 2008, 10:16 PM   #2
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No it's not right, of course. What are the ranges for your input and output? Is your output range so low that it is clipping off the peaks?
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Old 2nd June 2008, 10:17 PM   #3
adason is offline adason  United States
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may be you are clipping it heavily
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Old 3rd June 2008, 09:58 AM   #4
djk is offline djk
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Clipping?

For sure.

A phono input only handles a few mV (0.001V).

You also need an inverse RIAA filter to check response.
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