THE WW2 US ARMY SIGNAL CORPS VALVE NUMBERING SYSTEM -
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The US Signal Corps, used a numbering system of VT numbers, incidentally, the VT stands for Valve, thermionic – three electrode – a bit of a to do if you want to list a beam tetrode!!!! . The military look up table MIL-HDBK-213A is required to decode the 289 valves identified in this manner. However, for the ardent audiophiles, I have prepared this list of the most desired devices:-
