Braro,
Do you mean that the manual says "Syrah" but you have the Chenin?
The Change in name from Syrah to Chenin as I recall Mick explained to me was necessary because of the new phono section implemented. If your preamp uses 417A or variants in the phono section, then you have a Syrah. If it uses 6C4 and 6922, then it is definitely a Chenin.
Yes, the manual mentions "Syrah" but if you look at the very first page, it says, and I quote, ..."Thank you for purchasing a Supratek Chenin Preamp.....".
Also, I believe the Syrah has a Master Volume Control. My Chenin does not have one.
I could be wrong but that is what I got.
cheers!