A friend asked me a while ago why the FTS Cesium tubes were so light.
Since they were designed from the beginning to fit in a 5.25" high
chassis that cut quite a bit of the weight.
However a large amount of weight was saved by using a Ramsey cavity that
was not milled from a massive block of copper like the HP tubes use.
The HP cavities weighed about 3 1/2 pounds for a standard tube and 4 1/2
pounds for the high performance model.
The FTS design weighs a mere 14 ounces.
Attached is a PIX of the FTS cavity.
Cheers,
Corby
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