THE ADAMS CRYSTAL AMPLIFIER

The Adams Crystal Amplifier was invented, 1933, by Robert G. Adams, at the age of thirteen years, at 418 Queen Street West, Hastings, Hawkes Bay, New Zealand, the assembly of which is depicted, as Adams described it, in the artist's impression.

My set up looks primitive which indeed it was. I have no qualms about that as, at least, it worked as stated and proved back in 1933. The state of the art had not at that stage reached the miniaturisation of the present day.