I now fit extra loading sockets to all my phono stages, as I think it gives the most flexible way of altering the loading to whatever you want.
All that's needed is a phono plug fitted with the required components, or a set of plugs.
The Denon DL-103 has a source impedance of 40 ohms according to Denon's specs, so a load of 47 ohms would be very low and over 5dB of signal would be lost across the cartridge's internal impedance (as opposed to appearing across the phonostage's input).
Using the rule of thumb of having the load impedance ten times greater than the source impedance would suggest 400 ohms as a suitable load.
The DL 103R has a lower source impedance of 14 ohms and its load impedance should be about 140 ohms or more.
I've always fitted extra parallel sockets for loading plugs on all my phono stages as it offers complete flexibility in the choice of loading. IMO it is also not a good idea to have the usual tiny DIL (dual in line) switch units in use at such a sensitive low level and low impedance part of the signal path... especially as use, age and dirt take their toll...
Cartridges do vary considerably in their sensitivity to changing loading.
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