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.
John_tracy's description of "warm, larger images, softer focus" is closer to the sound of Philips E188cc than Siemens 7308, in my opinion. I have used both tubes in my system, and they're both excellent...just different flavors.
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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