[Hallicrafters] Piesoelectric effect case in point.

[rbethman]

Well,

It looks like the calibration crystal in the SX-101 series.

However, having dug into some 1947 documentation from Shure, I find I 
must "eat crow"!

It is two slabs of rochelle crystals that are anchored at one end, and a 
lever from the diaphragm attached to the opposite end.

I wonder why these hold up so much better than Astatic's elements?

I can only surmise that it has to do with the support system being so 
isolating, and made of rubber.

Mea Culpa!

Screwed up again!

Bob N0DGN

On 1/3/2011 10:09 AM, Robert Nickels wrote:
> On 1/3/2011 7:52 AM, rbethman wrote:
>>    large gold coated quartz crystal
> What makes you think it's quartz?
>
> 73, Bob W9RAN