An older design, and one cheaper than magnetic cartridges is the piezo-electric cartridges where the cantilever pushes against and bends material that emits electrons when bent. Other cartridges had material who resistance changed with such stressing/flexing modulating a dc current (the cartridge needs a power source). There are magnetic cartridges that employ electromagnets (field coil) instead of permanent magnets for their moving coil design. The rarest is probably the field effect transistor cartridge where a permanently charged electret is attached to the cantilever snd acts as the gate element of a transistor.
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?
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Heard the DS Audio W3 at a NY Audio Show on a VPI Avenger table. |
@richardbrand I have over the years been investigative of Cartridges using the photos supplied from well respected refurbishment technicians. Many Cart’s witnessed as a overhaul are from a Vintage era, and it does not take long to learn that designs in use today are those already once in use during the evolvement oof the Cart’. Materials have changed, hence the notion to create the almost same designs with modern used materials. I have been quite involved in learning how mechanical interfaces are influencing the End Sound of a TT > TA > Cart’ assembly, where a lot is learnt about how improvement can be found. Improvement found and implemented with mechanical interfaces, has then been encouraging to learn where there is betterment to be found with the signal path for the sent signal. As a result of experiencing a design using identical electronics where one version is high quality Cables and Cable Connections and the other a Low Eddy design. As a result of assessing End Sound produced from both versions. It leaves the assessor with no doubt that when creating a low eddy signal path the End Sound has a increased attraction. With this knowledge in mind, I put my thoughts to whether a low eddy design was available from the Cart’ itself. The search discovered the Cart’ in the Link, and for the notion it is a scratch built low eddy design, the Cart’ is seemingly unique. https://www.leson.org/shop/ls10-mkii-mc-cartridge/ The Mutech Hayate might also qualify for being unique as a design https://kaji-lab.co.jp/item.php?code=1746600471&brand=mutech
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