Did you ever get a chance to compare?
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I eventually did purchase a new Stage II STP-SE preamp from W4S. I am currently breaking in this unit. It takes about 300 hours and I am not there yet. My initial impression is that the imaging may be a bit more precise and that there is better high frequency extension and detail. I did not hear much of a solid state character from either unit. Preliminary impression is that the factory Stage II unit is better, likely due to the use of the naked Vishay resistors.