I am no expert but much of what you just posted from Audiotools is incorrect...with all due respect.
The SPU and Lyra cartridges have two coils and are wired or oriented internally for mono use. They are not true mono.
The CG25Di (there is no SPU CG25Di) is a true mono cartridge with a single coil. The design hasn't changed since 1948. The Denon 102 is also true mono but with vertical compliance.
Additionally, the Lyra mono cartridges along with other modern offerings use the same stylus as the stereo version. I'll leave it up to everyone to determine whether they believe such mono cartridges are worth purchasing or better to use a mono switch on their preamp.
It seems nearly every modern mono cartridge is equipped with the smaller .7 stylii than what was used during the 50s (1 mil or larger elliptical). My personal preferance has been for 1 mil for less than perfect early monos and smaller .7 mil stylus does indeed work well for my monos that are in great condition or mid 50s or later into stereo era (whereupon, stereo cartridge with mono switch is used).
The Shilabe design appears to be very different and interesting.
The SPU and Lyra cartridges have two coils and are wired or oriented internally for mono use. They are not true mono.
The CG25Di (there is no SPU CG25Di) is a true mono cartridge with a single coil. The design hasn't changed since 1948. The Denon 102 is also true mono but with vertical compliance.
Additionally, the Lyra mono cartridges along with other modern offerings use the same stylus as the stereo version. I'll leave it up to everyone to determine whether they believe such mono cartridges are worth purchasing or better to use a mono switch on their preamp.
It seems nearly every modern mono cartridge is equipped with the smaller .7 stylii than what was used during the 50s (1 mil or larger elliptical). My personal preferance has been for 1 mil for less than perfect early monos and smaller .7 mil stylus does indeed work well for my monos that are in great condition or mid 50s or later into stereo era (whereupon, stereo cartridge with mono switch is used).
The Shilabe design appears to be very different and interesting.