The Cardas Myrtle Heart is a Benz Ruby 3 cartridge that has been mounted on a Cardas Myrtle Wood Body.  It has all of the characteristics of a Benz Ruby 3 Cartridge.  The Myrtle Wood Body smooths out the sound of the Benz cartridge and makes it more musical sounding than the original Benz body.  It works well with a 1:20 Step up transformer.  That would either be the SKY 20 in HIGH or the SKY 40 in LOW.
 
Myrtle Heart Specification:
Body: Machined Vented Myrtlewood
Cantilever: Solid Boron rod, 0.28mm diameter
Stylus: Nude line-contact diamond, mirror polished
Stylus Tip Radius: 5 x 120um
Vertical Tracking Angle: 20-22 degrees
Coil: Square Ruby jewel plate, Copper wire
Weight: 9.1 grams
Output Voltage: 0.3mV @ 3.54 cm/s
Internal Impedance: 45 ohms
Frequency Response: 10-50,000 Hz +/- 1dB
Channel Balance: Better than 0.5dB
Channel Separation: Better than 35dB @ 1kHz
Tracking Ability @ 315 Hz with a tracking force of 2 grams: >80 um
Dynamic Compliance" 15 um/mN
Recommended Loading: 500-47,000 ohms
Optimum Tracking Force: 1.8-2.0 grams
Recommended Tone arm Mass: Medium to high
Recommended Break-in period: 40 hours