Genz Benz Neo Pak Tube replacement?

What would be some good options for replacement tubes for my Neo Pak that may warm it's tone up a bit more?

It comes stock with a 12AX7 tube, but I'm not sure of the exact model, etc.

90% of the time I'm playing modern sounding active basses through my NeoPak paired with 2 2x10 cabs stacked vertically and some times it can be almost 'to' modern sounding. Hence thinking about trying some different tubes.

Or, also thinking about Barber Linden EQ or Flipster pedal for when I need to mellow/vintage things up a bit.


Thoughts/Suggestions would be greatly appreciated.



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Good thread, and definitely some ideas in there.


JJ ECC83 and Telefunken ECC83 both sound very interesting.