Nigel
Been here a while! 
Watching over Gotham City keeping us safe
Posts: 2,064
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Post by Nigel on Sept 10, 2011 16:59:23 GMT
I have just received a Rogers Moving Coil head amp (a 9v pp3 battery powered device that steps up an MC output so it can be used into an MM input) that I won on ebay. The unit has multiple switches for gain, resistance and capacitance loading. How does one find out the recommended capacitance loading if the manufacturer hasn't given any details in the owners manual? Is capacitance loading of importance to moving coil cartridges? At the moment I'm using listening evaluations to obtain the considered best results.  |
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XTRProf
Fully Modded
Pssst ! Got any spare capacitors ?
Posts: 5,689
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Post by XTRProf on Sept 12, 2011 8:52:01 GMT
Is capacitance loading of importance to moving coil cartridges? At the moment I'm using listening evaluations to obtain the considered best results. Yeah, you are right. Capacitance is not of importance to low output mc due to it's low internal resistance and inductance if I'm not wrong. I had done some mathematics on it many years back and had forgotten much of it. The resonance frequency is out of the range of the cartridge frequency response. It should be mathematically that. Correct me if I'm wrong, can you vinyl guys. Normally, about 10 to 15 times of the internal resistance of the mc will already provide a good place to technically load the mc correctly. Of course, the final sound should have the last say. |
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rowuk
Been here a while!
Pain in the ass, ex-patriot yank living in the land of sauerkraut
Posts: 1,011
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Post by rowuk on Nov 6, 2011 19:43:08 GMT
I play records with real instruments and voices and adjust for "realistic" sibilance, trumpet brilliance and violin sound. It is close enough when the instruments sound right. I don't need to measure anything
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lini
Been here a while!
Groanings from Han(g)over
Posts: 191
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Post by lini on Mar 21, 2013 7:40:44 GMT
XTRProf: A bit late to chime in, but just for completeness. Yes, you're pretty much right - the formula for the electrical resonance simply is 1 / (2 x pi x (L x C)^1/2)), so due to the very low inductance of MCs, that resonance would already be at several 100 kHz for high output MCs and even several MHz for low output MCs. Nevertheless it would seem like the capacity could still make a bit of a difference when one checks for square wave response - but of course it's pretty debatable, whether that would make that much of a difference in practice...
Greetings from Munich!
Manfred / lini
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