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Tube question: any sonic difference in 6SN7 vs 6H30 vs 6H80 in the amp's signal position?

Tube question: any sonic difference in 6SN7 vs 6H30 vs 6H80 in the amp's signal position?

Reason I ask is I just received a new-to-me BAT VK-55, and it has 6SN7 tubes in the signal positions, which is also what the manual references as the right tube, but the Stereophile review, in the specs page, references 6H80s in the same position, and VK-55SE uses a pair each of 6SN7s and 6H30s.  

BAT output tubes are 6C33C-Bs, so no tube rolling here, as it appears Solvtek is the only manufacturer of this style tube. I am wondering what if anything I can do with the signal tubes to help improve clarity of higher frequencies?
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Showing 2 responses by hasmarto

hasmarto's avatar
hasmarto
162 posts
 
@atmasphere, I realize this thread is old, but I think folks who use 6C33C tubes must know that those are going to be around for a long time, since now New Sensor is the only company that has a huge tested supply in the US. The information came from Vivatubes, they’re one of their distributors.

BTW, Soviets made billions of them.
hasmarto's avatar
hasmarto
162 posts
 
“:) a bit of hyperbole, I'm sure”

Just a little bit :)

To be honest, considering the humongous amount of lemons, they had to make much more than needed, especially when those were used in the military industry. I lived there for 35 years, and never saw  those in the commercially available devices.
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