Not true. The SP-9 has two tubes, one in the phono section and one in the line section. It is a hybrid though. Maybe you were thinking of the SP-14 which only has one tube in the phono section. I owned the SP-14 and didn't like it.
A past owner of the SP-9 MKI & II and recent owner of the SP14 I should have known better. Perhaps it's because they sounded so solid state. Age is humbling. My apology MEP.