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Peter Wieck[_2_] Peter Wieck[_2_] is offline
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Default The most important tubes ever made.....

Not hardly.

The most important tube ever made, very likely, was the 200-series Directy Heated Triode. With which one may duplicate pretty much any function at pretty much any level of pretty much any tube you listed. The only limiting factor would be the quantity required.

Much as the Ferrari V12 followed from the first Otto-cycle naptha-powered engine, and so, while impressive, could hardly be described as Important.

Peter Wieck
Melrose Park, PA