Sjy425/Audiofun
Richardkrebs criticism of the Ultra 5 may be a result of changes he has made to his Technics and Eminent Technology ET2 tonearm, both of which have substantial changes from standard and bear little resemblance to the original designs.
Richardkrebs SP10 turntable is radically different from the Artisan Fidelity, it uses a basic acrylic and lead sandwhich for the plinth.
With regard to the Eminent Technology ET2 tonearm, Richardkrebs has removed the patented decoupled counterweight mechanism and added lead mass to the arm.
The patented split counterweight mechanism is designed specifically to split the bass resonance and reduce distortion by lowering the mass the cartridge sees above FR. One of Bruce Thigpens specific design goals, based on sound mathematical principles and physics, and thorough testing, were intended to keep the horizontal mass as low as possible. Richardkrebs modifications to the ET2 increase distortion as demonstrated on Bruce Thigpens website with properly documented testing.
For further information here is a link to the issues involved.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1325551242&openflup&1035&4#1035Richardkrebs issues with the Ultra 5 may indeed be artfiacts of his particular set up and I would encourage readers to try components in their own system where possible.