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Audio and Video Talk
Vinyl
The dreaded stubborn hum
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<blockquote data-quote="Ampdog" data-source="post: 71477" data-attributes="member: 144"><p>That would give a theoretical -3dB point at 60kHz with the usual 47K.ohm load. But MM cartridges are inductive and depending on the value, an increase in high frequencies could be found. The head inductance is specified for the better models, or could be found from the manufacturer.</p><p></p><p>A good test with a scope and signal generator can reveal the exact electrical picture. Feed a 1k - 100kHz current (signal generator through say 100K) into the pickup lead using a low capacitance scope probe and draw the impedance-frequency graph.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 71477, member: 144"] That would give a theoretical -3dB point at 60kHz with the usual 47K.ohm load. But MM cartridges are inductive and depending on the value, an increase in high frequencies could be found. The head inductance is specified for the better models, or could be found from the manufacturer. A good test with a scope and signal generator can reveal the exact electrical picture. Feed a 1k - 100kHz current (signal generator through say 100K) into the pickup lead using a low capacitance scope probe and draw the impedance-frequency graph. [/QUOTE]
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Audio and Video Talk
Vinyl
The dreaded stubborn hum
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