Ecmlee,
I do not know about the Chenin's phono stage being sensitive compared to the Syrah since I have no experience owning the latter. All I know is that I get better feedback replacing the 6C4 tubes than the 6922's in my phono stage. At present, I am using the Sylvania Gold Brand gold pin 6C4 and very happy with the results. A few post above, I tried several other 6C4's and I can say that I am finding the result consistent with what I posted before.
I do not know about the Chenin's phono stage being sensitive compared to the Syrah since I have no experience owning the latter. All I know is that I get better feedback replacing the 6C4 tubes than the 6922's in my phono stage. At present, I am using the Sylvania Gold Brand gold pin 6C4 and very happy with the results. A few post above, I tried several other 6C4's and I can say that I am finding the result consistent with what I posted before.