Don't know which Thor Pre-amp you are using. Is it possible that you have not set the cartridge load properly? The Dynavector cartridge you mention is a moving coil cartridge with a .23mv output and not a moving magnet as you said (unless there is some other version of it). The Thor TA-2000 seems to have the option of switching loads in its Moving Magnet section from: Resistor 470k, 47k, 1k, 100 Ohms. The moving coil section of that preamp is auto-loading so no need to set it. If you are running a moving coil cartridge through the moving magnet section of your pre that may explain the poor sound quality. Check that you've matched the load to your cartridge output.
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