@testpilot The Herron uses external loading plugs, although the designer feels it sounds best unloaded.
Interestingly I have always found my Herron to sound better with loading - and in fact at a loading usually very close to cartridge manufacturer recommendations. I know some stages like Sutherland's Little LOCO uses transimpedance amplification so you never dial in the loading using a switch but there is still loading. And then you have some Boulder stages that have fixed loading but with no switches. It seems that
@atmasphere is saying that only phono stages they don't present any cartridge load are properly designed...I'm still not totally understanding this, especially since the cart manufactures recommend a load.