Hi Everyone What would you recommend for a replacement 12ax7 or 7025 for my Eden WT-400? The original died, and I've only got another tube that's about 15 years old to replace it, so I should probably go get a new one. Since it's a hybrid design, I'm assuming there's no point in NOS or fancy options but I'd appreciate suggestions. Also, while I have the top off, are there any parts I should be cleaning out, lubricating or spraying out? I'm not particularly handy but it wasn't a lot of trouble to remove the lid and switch out the tube. . . . Thank you.