Peter Jensen and Edwin Pridham had a small farmhouse at 1606 F Street in Napa from 1911-1916. Their initial goal was to improve the sound of the telephone. That endeavor turned out to be unmarketable, but in 1915, they started working on a way to transform their telephone research into an amplification system. Their first successful effort resulted in the first known example of feedback - “a screaming howling noise which was ear-splitting and terrifying” as Jensen described in his book “The Great Voice.”

This Black Magnavox Radio Speaker Horn resides with reclaimed walnut base.