The Marconi Transmitting Valve / Vacuum tube MT1 MT2 MT11
If any of the following you know to be incorrect, or you can add anything to my Knowledge of this valve, please email the link is at the bottom of the page.
This is without
doubt the most Historical wireless item that has ever come my way. This MT2
was found by a friend in Argentina. South America. with the vacuum and the heater
filament miraculously intact. A valve similar to the one shown MT1/2 was used
in the pioneering transmissions from Ballybunion Ireland across the Atlantic
in March of 1919. One of Marconi's top engineers Henry Joseph Round Designed
this early series of valves. In 1912 Henry 
Round
was sent to South America to personally modify the transmitters there . It is
surely no coincidence that the valve shown below was discovered there 80 years
later. In 1921 Henry Round became Chief of Marconi Research. For the full story
on Henry Joseph Round, see the link below.
The MT2 was also used in the first transmitter for the Marconi Station 2lo, it can be seen in the Circuit Diagram as the oscillator and modulator. On the 11th May 1922 with only 100 watts of power the transmitter at Marconi House in the Strand London, started its first transmissions, with the famous call sign 2lo calling. The transmitter was saved and rebuilt in the 50s. It has appeared in a few exhibitions, but sadly It is now the property of the Science museum and has been in store unseen by the public for some years.
Lincs to :-