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Radio Record, Volume I, Issue 4, 12 August 1927, Page 5

We are on the verge of still more wonderful things in radio. A valve of ligher sensitivity than heretofore ‘nown was demonstzated recently in New York. The valve, which is termed a "prid-glow" relay, being filled with neon, is said to cause a modification in the plate current 100,000,000 times as great as that on the grid; or, in other words, it will respond with a 25-milli-ampere current to the most infinitesimal chance in its adiustment