Hi David:
I've never tried the later Sylvania's (Green). I have used Green 6922/6dj8's which were pretty good though (they were specialy screened/selected).
You might ask Rogue about using 5814, 6189 and possibly 5963 tubes. The 5963 tolerates less plate voltage than a 12au7, so it's not a direct sub in all circuits.
I'm also curious about Tungstram Ecc82's, but stopped buying tubes quite some time ago. They used to be listed @ ATSI Tube.
Maybe try a "Rogue 12au7" search @ AA? I prefer to research tubes as they are used in my paricular gear.
I've never tried the later Sylvania's (Green). I have used Green 6922/6dj8's which were pretty good though (they were specialy screened/selected).
You might ask Rogue about using 5814, 6189 and possibly 5963 tubes. The 5963 tolerates less plate voltage than a 12au7, so it's not a direct sub in all circuits.
I'm also curious about Tungstram Ecc82's, but stopped buying tubes quite some time ago. They used to be listed @ ATSI Tube.
Maybe try a "Rogue 12au7" search @ AA? I prefer to research tubes as they are used in my paricular gear.