[Amps] Pink ceramic

[John Lyles]

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