Science: Tube Tumult

In the matter of radio tubes a spirited ruckus was well under way last week following a polite invitation by General Electric Co. to members of the "radio press" to inspect a new tube, unfamiliar on this side of the Atlantic. Smaller (3 x 1 in.) than ordinary tubes, the GE gadget had a black steel casing instead of glass, and its glow was hence not visible. Advantages pointed out by the company:

1) Faster heat radiation, lengthening life. 2) Smaller size, saving space. 3) Better lead wire arrangement, improving short-wave reception. 4) Increased...