Burle Industries (former RCA-Lancaster, PA operation) quit using Frenchtown
pink ceramic by the end of the 1980s in most cases. They were beautiful tubes,
esp when they had the gold flash on the anode cooler, like many of the Cermolox
UHF tubes.
I agree with Carl and others here, BeO ceramic is used where you want to
CONDUCT heat through a dielectric insulator. Used for conduction cooled finals
in some of the old Motorola base station amplifiers, and also in the bottom of
many RF power transistors, to the base flange. Alumina ceramic is used on the
cylindrical rings beneath the anode and other electrode connections on most
power tubes.
73
John
K5PRO
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