The Grant Fidelity 12AU7-T is noticeably better than the stock JJ ECC 803S!
... Last last note - forgot to mention - the static sound when changing volume is gone too! For that reason alone probably worth not using the JJs!
I have a Grant Fidelity Psvane 12AU7-T w/ about 60 hrs. logged in my M-451 Sensation w/ Dodd tube buffer. Very nice!
As an added bonus, I too can verify the rustling leaves sound is NOT present w/ this tube.
I still prefer the Sylvania Gold Brand 5751, but the Psvane is brand new (not NOS) & it sounds great.