Sp9 Mk III was probably the most disappointing component i've purchased over many decades in audio. This hybrid pre sorely lacks resolution, transparency, in this case absolutely true, you can't make a silk purse out of a sow's ear. Other than trying various tubes, the only mod I did was an IEC receptacle so I could try various power cords, neither did a thing to help. Good advice, sell it, and yes the SP10 was/is a far better pre.
