What are thermatrons and why should we still use them?

Discussion in 'KJ7UM - Grayson Evans' started by 4Z1UG, Jun 21, 2016.

  1. 4Z1UG

    4Z1UG Eric, 4Z1UG

    Grayson,

    What are thermatrons and why should we still use them? Can you plug you book as well?

    73,
    Eric