[time-nuts] Low frequency crystal

[Robert Atkinson]

    Hi,

    I just found a 1000c/s (yes 1kHz) quartz crystal at a local radio car
    boot sale. It's a NOS GEC "Quartz Crystal Unit" type DJC/669. It's in
    an overlength minature valve (tube) glass envelope. The crystal is a
    long slab with 3 connections. The 3rd connection seems to be a small
    (feedback?) electrode.

    What's the lowest frequency crystal made? Anyone have any suggestions
    for an oscillator circuit?

    Robert G8RPI.
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