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Originally Posted by DavGoodlin
Good tangent there! Zenith and some others like Fisher needed long-lived tubes for their high-fidelity console "stereos", so they went to Amperex and Mullard for tubes 
This applies to some of the TV's too. A good example is the 6EH7, 6GJ7 and other frame-grid tubes made in Europe that Zenith, RCA, Motorola and others used. Japan supplied some tubes to manufacturers in the 1960s as well. |
It wasn't as much long life as it was low noise and hum. Some tube types were European only for the best performance and lowest noise/hum, some of the USA counterparts had industrial/military versions for that purpose, often different types.