Vintage 1940s Sylvania 6SN7 GT (not GTA or GTB - can't see it in the photo, but it's "GT") w/ tube riser. Purchased "NOS" by me, used with care (i.e. not left on for extended periods, not power-cycled excessively, etc.) for about a year. These are considered the best of the best and sell for ~$180 "NOS". Letting this one go because I sold the amp that I used it in. (*This tube is MAGIC in Schiit Lyr)

Free Shipping within the US via FedEx, UPS, or USPS Priority; to Canada or Europe at cost. Payment by Paypal (price net to me) or Venmo.

Ebay, heatware, & head-fi seller history:
https://www.ebay.com/usr/chrisnyc75
https://www.heatware.com/u/67601/to
https://www.head-fi.org/classifieds/member-feedback/chrisnyc75.538898