Tubes used in VTL 6.5 II preamp?


Hi -- does anyone know what brand 12AU7s VTL uses in the 6.5 II preamp?  Much thanks.

And if you have/had a 6.5 II and tried different tubes, would appreciate hearing your thoughts.
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believe the factory installed tubes are JJs. Dont have the 6.5 but do have the 7.5. You may want to try installing some PSVANE T-IIs. most open and 3-D tube I have tried so far.
You're  correct, it is JJs, I have confirmation now from VTL.   

I'll give the PRSVANE's a try, thanks for the tip.