What innovative, unconventional cartridge designs can you recommend?


Most cartridges have a stylus and cantilever where the transducer (magnet, iron or coil) sits on the far end of the cantilever.  What other designs are there?

I am mindful of two designs which put the business end right on top of the stylus.  The first is the moving coil (MC) Audio Technica AT-ART1000 which places two tiny coils, each 0.9-mm diameter, with eight turns of wire directly above the stylus.  Australian price is about AUD-7000 and there apparently is a newer model, slightly less exxe. the ART1000X.  This has square coils for a bit more output, and threaded mounting holes.

A downside is that stylus replacement involves a factory maintenance program and the Australian website page describing this service does not exist.

Another design is optical, exemplified by DS Audio's range.  While these still need a stylus to trace the groove, the signal is produced by reading the intensity of light produced by a Light Emitting Diode (LED) hitting two sensors.  Between the LED and the sensors are two 'shades' mounted above the stylus which change the amount of light as the stylus vibrates.  These cartridges need a special "photo-stage" to replace the conventional phono-stage which is an additional expense.

Australian prices including photo-stages range from AUD-2,150 for the DS-E1 to the DS Master 3 at approximately AUD-40,800, which is a bit outside my price range!  Where is the sweet spot?

What other way-out designs are there?

richardbrand

@lewm 

RB, in your calculation of current, I think current out is equivalent to V out divided by internal impedance, rather than by load R. Load Z determines what becomes of the output.

It really is a question of how the manufacturer defines the cartridges' output voltage V.  Is it into a load, or into an open circuit?  It will be a higher number if measured into an open circuit.

In a real circuit, the current should be V divided by the total circuit impedance.  There is only one voltage source and it has to drive current through the entire circuit.

I am just discovering that the Japanese sometimes have their own ways of defining quantities!

@audphile1 

I’m assuming the unit voltage is correct and you just need a proper power cable. Not sure why soulnote says you can’t use any power cord that’s in working order

I have had a good look at the power cord SoulNote supplied, and without dissecting it, it does look like a standard, earthed, three connection power cord.  The distributor, you and common sense, all say any power cord will do.  The distributor also says all his customers use expensive audiophile-grade power cords!

So why does SoulNote explicitly state that only the supplied power cord should be used?  Possibly it has magic properties, internal shielding, anti-static impregnation, hidden ferrite rings.  I don’t know. 

Or possibly, they don’t want their customers to waste money on expensive aftermarket cords!  I prefer that explanation.

In another thread, we are discussing XLR cables.  SoulNote produces XLR cables which are unshielded, but specifies shielded in the user manual for my SoulNote E.1 Ver 2 Equalizer.  They are not shy of charging big money.  Their RCC-1 Clock Cable is about A$16,000 for 1.2-m.  Fortunately you only need one per clock

 

oops.  I've just re-read my SoulNote User Guide and I cannot find any text that specifies shielded cables for balanced operation.  My mistake ;-(

If you’re talking about the current output of a cartridge it’s generally to get a handle on how much current it can deliver to the phono, so you can disregard the phono input Z or assume it is zero. Then the current output is approximated by Vout divided by internal Z or R. This is how one decides whether the cartridge is suitable for a current driven phono, where input Z is ideally zero but never really is. In a voltage driven stage, the cartridge output immediately is seen as a voltage when it encounters the resistor at the phono input. An LOMC cartridge with a 2 ohm internal Z and an 0.2mv output makes more current that a LOMC with the same Vout and a 10 ohm internal Z. (Using Z and R interchangeably). In your original statement you did not mention internal Z at all. That’s all I’m saying.

@richardbrand cool. Am I incorrect in thinking this phono EQ supports your current MC or MM cartridge?