This retro vacuum tube from Tesla, model AZ1, is a great addition to any vintage audio and video collection. It has been tested on a tube tester, specifically a Tesla BM215A, and is in good working order. The tube is supplied with the original box and was made in Czechoslovakia. It is ideal for those interested in vintage tubes and sockets, as well as vintage consumer electronics parts and accessories. Add this tube to your collection today!

The price is for 1 piece - I have 4 pieces The tubes have the same inscriptions - they are identical!

They are all NOS, they were closed, I opened them and tested them.