piezzo crystals..

[45rpmdude]

From: Chris Baker <chris@singlecrystalquartz.com >


Fused Silica, Single Crystal Quartz Wafers

Hello ,
Large selection of Fused Silica/Quartz and single crystal quartz (seeded and seedless) AT, ST, X, Z cuts available wafers in stock. From thin to thick SSP and DSP SMALL QUANTITIES available.
Fused Silica Grades
JGS1, JGS2, JGS3 - emails chris for definition if you need!
100micron to 6.5mm in stock. Diameters up to 300mm.
Please email us your your specs so we may quote you, or let let us know if we can quote you on another substrates.
If you can't use, please forward to a peer who may have a need!
Thanks

Chris

[grooveguy]

Chris, ...are you talking blanks for oscillator crystals, or a piezo element that might provide enough displacement to move a recording stylus? Brush had very good results with their lateral recording head back in the 1940s, and of course Astatic OEM-made cutterheads for most all General Industries recording decks used in Sears, Wards and other recorders and combo consoles. But whether you need some form of linkage that provides "mechanical advantage" to get the stylus to move sufficiently, I just don't know. Figuring 200 lpi for microgroove recording, adjacent grooves are 5 mils apart. Figuring "full modulation" with the + of one groove kissing the - of it's neighbor, the stylus has to move ±2.5 mils. And if you are clever enough to configure a stereo cutterhead, it actually has to move a bit more for the same lateral displacement, being driven at a 45 degree angle. I have often fantasized about a stereo piezo cutter, but figured that the displacement of a piezo element just wouldn't hack it. Think of it though: a stereo cutter in the same form factor as a Presto 1D head!

Snap4.jpg

This is the Brush RC-20 'crystal' cutterhead mounted on a Presto K-series machine. I don't know if it was optionally available, or if any Presto machines were sold with this head. Obviously it would be a more fragile option for schools, churches, etc.