Wow, this is amazing Günther!  I love the history that you have provided and the way that you have incorporated the Lectron System.  Truly innovative and very engaging!  Thank you so much. 

    What a rarity to have the 1939 prototype-early issue of the steel tubes.  This is the first time that I have seen such things.  You are a treasure trove of history and electronics inventions!

    I have to say that I would love to see a video demonstration of your tube based Lectron System shown in the above photos!

    Thanks so much,

    • This reply was modified 3 years, 11 months ago by Michael.