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Dating rca tube

His transatlantic triumph came on the 12th December 1901 when the morse letter 'S' was transmitted from Poldhu, in Cornwall and received by Marconi himself at St.John's, Newfoundland, who recorded the historic event in his pocket book simply "Sigs at 12.20, 1.10 & 2.20".Indeed many wireless operators came from the telegraph ranks.- By 1850 most of the basic electrical phenomena had been investigated.However, James Clerk Maxwell (1831-1879), Professor of Experimental Physics at Cambridge then came up with something entirely new.By some elegant mathematics he had shown the probable existence of electromagnetic waves of radiation.But it was twenty four years later (eight years after Maxwell's death) that Heinrich Hertz (1857-1894) in Germany gave a practical demonstration of the accuracy of this theory.He generated and detected electromagnetic waves across the length of his laboratory on a wavelength of approximately one metre.

Start your day with Larry Richert, John Shumway, Paul Rasmussen anchoring news and Kathy Berggren’s traffic reports on The KDKA Morning News, 5-9 […]Welcome to 93-7 The Fan on CBSPittsburgh.com!

The hearing for three men charged with killing another man and his 7-year-old son in Swissvale was abruptly continued Friday when a witness suffered a medical emergency; KDKA's David Highfield reports.

Cruise companies have stepped up their offerings to widen appeal to a younger demographic.

DX is an early telephone term for distant exchange.

It is also defined in Funk & Wagnall's as Distance.


  1. The online versions I've seen suffer from some OCR artifacts, though, and I was always digging through it to find the table of 2-letter date codes. So I extracted the table, cleaned it up a bit, and attach it here in case anyone else might find it helpful View attachment RCA 2 letter tube codes clean.pdf

  2. Balanced and Unbalanced Connections Mike Rivers The meaning and significance of balanced and unbalanced connections is one of the most misunderstood.

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