[Hallicrafters] Piesoelectric effect case in point.

[mac]

Had one of the old tubular ceramics in an ARC-5 transmitter (PA DC  
blocking cap) explode on me once .  Went off like a firecracker!

Dennis D. W7QHO
Glendale, CA

******************
On Jan 2, 2011, at 3:19 PM, Carl wrote (in part):

> Ceramic is a brittle crystalline substance, constant heating and  
> cooling can
> create tiny fractures. In RF Ive heard transmitting ceramics sing  
> (buzz)
> when on the way out.