[sdiy] UA726 was: new Texas ic log102 ? log ratio amp

[Ian Fritz]

We also used to change frequencies by either grinding the xtal down with 
emery paper or by rubbing a bit of solder into the large face.

At 12:10 AM 4/5/2002, Glen wrote:
>I have actually heard of some people
>"fine tuning" the frequency of the crystals by dipping the quartz elements 
>in a
>vat of acid to slowly etch away some of their size, and slightly increase 
>their
>frequency.