This has been covered elsewhere but seems to need repetition.
Most Low Output Moving Coil cartridges are unaffected directly by the load, other than the output that have if the load value is too low. But we hear differences at times- so the load is making a difference in some cases.
Here is what is happening:
The cartridge has a small inductance, and the interconnect cable has a small capacitance. Together they form a Radio Frequency (RF) tuned circuit. The action of the cartridge provides the energy to 'excite' the tuned circuit- essentially the phono section is subjected to bursts of RF energy!
Now some phono sections don't care about this, if that is the case you will find the stock 47K to work fine. But if you find that the loading makes a difference and is critical, this is because the load value is reducing the 'Q' (Quality) of the RF tuned circuit, thus reducing the RF bursts. IOW the preamp is sensitive to RF!
If a cartridge manufacturer recommends a loading value, it almost always means that the phono section they use has this sensitivity. Further, it is indeed affected by the interconnect cable as Raul pointed out, so the actual loading value is variable. In short I would pay no attention to the recommendation from the manufacturer in this case.
Instead go with your ears. Try it with no loading first. Then try the highest setting offered by the preamp and work your way down. You will find out in short order whether your preamp is sensitive/has a problem with RF.
Most Low Output Moving Coil cartridges are unaffected directly by the load, other than the output that have if the load value is too low. But we hear differences at times- so the load is making a difference in some cases.
Here is what is happening:
The cartridge has a small inductance, and the interconnect cable has a small capacitance. Together they form a Radio Frequency (RF) tuned circuit. The action of the cartridge provides the energy to 'excite' the tuned circuit- essentially the phono section is subjected to bursts of RF energy!
Now some phono sections don't care about this, if that is the case you will find the stock 47K to work fine. But if you find that the loading makes a difference and is critical, this is because the load value is reducing the 'Q' (Quality) of the RF tuned circuit, thus reducing the RF bursts. IOW the preamp is sensitive to RF!
If a cartridge manufacturer recommends a loading value, it almost always means that the phono section they use has this sensitivity. Further, it is indeed affected by the interconnect cable as Raul pointed out, so the actual loading value is variable. In short I would pay no attention to the recommendation from the manufacturer in this case.
Instead go with your ears. Try it with no loading first. Then try the highest setting offered by the preamp and work your way down. You will find out in short order whether your preamp is sensitive/has a problem with RF.