Comments from Simon N. in Ontario:
I have a GrantFidelity A-534 with a set of Telsa EL34’s NOS, they’re good to me compared to the stock GF (Shuguang generic clear glass) tubes, and initial thought on the black bottles, they weren’t as open and quite rough sounding compared to the Telsa’s. Burned them in more hours but still not too impress, then I left the amp on over night for good couple of weeks to burn them in. Now they sing!!! Sounds very live with these new tubes and very smooth sounding.
They also look nicer than the Telsa with the black coating on the glass. I’m not sure if I can get better tubes for what I spent on these, but they worth every penny to me!
Simon
original post here: http://grantfidelity.com/forum/viewtopic.php?t=291‘