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Welcome to my current obsession - primitive tubes & valves produced during the first few years after the Armistice of WWI was signed.
Those first years, namely 1920 through 1922, represent inventors and engineers across the world hammering out improvement after improvement until wireless communication was a reality.

As a retired engineer, my workbench often involves resurrecting odd tubes, or cleaning and conserving them.

A big chunk of my research spilled out into the 1920s, and the immense variety of 201 amplifiers that were made, soon piqued my interest. Researching early tubes has required studying in reverse, then analyzing evidence again played back forward.

As I document the 201s in my collection, I will be offering most for sale on my sale page. If something grabs you, reach out with a reasonable offer.

-Chris