The magitron tube end is made out of some ceramic with an exotic element and when ... Beryllium oxide (BeO) which is carcinogenic. ... shape or just a copy of an ancient armor from the bronze age will fetch you a lot of $$$.
In the early years of audio, power amplifiers had tubes with very low output ... fabric, aluminum, titanium and rare beryllium or exotic composite materials. ... bonded to an aluminum or bronze disk of slightly larger diameter.
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