Originally Posted by Richi
Yes indeed we cannot remove cable capacitance from cartridge loading circuits. Its a shame that variable capacitors are so expensive as it would be much easier to dial in. Still, there's always methods to add capacitance to a circuit and rotary switches can do the job, though a pain to implement.
Nice write up here about the issue with Nagaoka, this was the older model, look how many pf get the best result, though at a compromise.
Certainly there are better budget Hi-Fi carts around.
Yes this is quite annoying. What's more annoying is how modern pre-amps and amps don't even have a button to change the loading or rarely give you the spec.
Remember those old Technics amps were you could change the resistive and capacitive loading by the push of a button ahhh good times.
It's easier to add capacitance then take it away so makes no sense to me when you have modern pre-amps that already have say 200pf.
I have a feeling that the cheaper Nagaoka's are designed for a higher capacitance.
With low capacitance, the response is the mechanical response of the cantilever.... on the MP11 with aluminium cantilever you get losses due to flex of the cantilever which drops the midrange - on a boron cantilever this should be reduced to at least half or 1/3 the droop, so it might drop by 1db instead of 3 in that midrange trough area... the rise in the high end shown on those graphs around 15kHz or so, are due to the mechanical cantilever resonance due to its effective mass - the much lower effective mass of a boron cantilever should move this resonance up to well over 20kHz, leaving a much more neutral high end.
It is quite typical of more basic aluminium cantilevered cartridges that high capacitance is needed to boost/fill-out that midrange area, and roll off the high end resonance.
But with a boron cantilevered (ie: high end) cartridge, the capacitance needs to be kept much lower, you won't be needing to generate an electrical resonance in the midrange to boost the trough up, nor will you need to roll off so early to control the mechanical resonance....
The same cartridge body with a basic needle might sound best at 600pf, and with a top notch boron needle might sound best at 150pf .... in fact that would be my expectation.