A Long-lived Marconi Valve
"THE following paragraph ‘from ithe "Wireless World" will no daubt be of interest :-"5XxX is making a ‘bid for the valve longevity record. A modulator valve which has just been superannuated on account of low emission has spent a useful life of 12,571 hours 17 minutes. Work it out ‘you will find that this. amounts to almost 524 days of continuous working! "The valve was first put in cirenit on November 21, 1925, and has functioned for every minute of Daventry’s transmission since that date. There are several other valves at Daventry which are well on the way to equalli this record. ‘One has been in use @ between ten and eleven thousand hou and another for nearly ten thousand, and they are both going strong." The valve in question is a _Marconl Cami valve. .
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290201.2.55
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Radio Record, Volume II, Issue 29, 1 February 1929, Page 26
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138A Long-lived Marconi Valve Radio Record, Volume II, Issue 29, 1 February 1929, Page 26
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