We have 8 of these "gold aero" vacuum tubes. Commonly found in AKG Tube Microphones.
We have an extensive list of about 3,000 tubes for sale, most of which are NOS (New Old Stock) and NIB (New In Box). Here is a link to access the list. If you highlight the link and right click it, you can open it. If you're interested in any tubes, call or email Dan, (but do not text, please!) for more information. +1-510-527-1411 or dan@danalexanderaudio.com
https://docs.google.com/spreadsheets/d/1u7DLIreDNMki1CLRyPUSaS18uy_zLmHr9ft15OX10Is/edit#gid=0