I disagree with John_tracy, Siemens are not warm sounding tubes. Compared to Amperex's and Mullard's, the Siemens sound leaner. That doesn't mean that the Siemens sound bad, mind you.
When I had my version 2, I found the 6dj8 amperex's to give the best soundstage/imaging/bass, plus I have a ton of them for pretty cheap if you need some, both NOS and like NOS.
I have tried mullard/siemans/amperex ect and found the amperex to give the best sonics for MY EARS.
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