Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
http://www.radiomuseum.org/tubes/tube_sn4935.html
This link was posted by a new member.
Somehow during Moderation check his text was lost!
[Please repost your original]
https://www.radiomuseum.org/tubes/tube_sn4935.html
Thanks for your help