Original 1943 electrical trade vintage ad for RADIO CORPORATION OF AMERICA.  (RCA). 

Manufacturers of Electron Tubes.

RCA-2050 - the Thyratron that started a new trend in electronic control.

A Thyratron is a "trigger" tube - a grid-controlled rectifier, which can "switch" power from full OFF to full ON with a very small change in control voltage. The RCA-2050, announced in 1939, was a great step forward in Thyratron design because it combined unusually high stability and great sensitivity.

Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.