Hi Rojd, I’ve had my Le Bass pedal for a couple of years and it’s still sounding great. Mine gets used about five hours per week with the band as an “always on” part of my board and maybe another hour or two at home.
It’s funny, I’m always experimenting with different tubes in my Vox guitar amp, but I’ve hardly even looked at the one that came in the Le Bass...I don’t even know what brand it is. I guess I’ll have to try a few different ones in there to see how it affects the tone. I’m assuming it’s relatively easy to change and tubes aren’t all that expensive so I wouldn’t let any of that stuff deter you from getting a truly awesome pedal.
According to Two Notes' website info, the tube is a Ruby 12AX7AC5 HG. From what I've seen, they can be had for $15+-. It says that any 12ax7 can be used. Two notes has an faq on changing the tube, doesn't look to bad, if one ever needs to. For someone like me, not likely.
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From this link:
The tube used in Le Preamp is a Ruby 12AX7AC5 HG. You can also use any standard 12AX7 tube as a replacement.