Up for sale in great condition is one TAD 12AX7 preamp tube. I don't have much information on the preamp tube, it came with a Mesa Boogie Walkabout I purchased a while back. I don't see any wear on the tube itself. The tube was clear, bright, and made the Walkabout breakup at lower volume when played with a Sire V7. Asking $10 shipped in the US. Feel free to ask any questions. Thanks!