Re: Brimar or Mullard 12AU7 Tubes
Here is the correct link to the tube source in Cashmere. They have the tube you are looking for at $25.00 each. Wow.
Link to web page http://www.vacuumtubes.biz/tubes-1 The link to the tube inventory is on this page.
List of available tubes with pricing from the above link. https://static1.squarespace.com/static/57ae25c75016e1690c41b053/t/5e042d733c0d2457768bd10f/1577332114147/tubes.pdf