The QR132 is not a thermionic device but a quartz crystal. Such a large sheet of quartz will have a low resonant frequency, probably lower than 100 kHz and possibly down to audio. In use the very high Q of the crystal will keep an oscillator much more stable in frequency than an LC circuit. All crystal oscillators are subject to drift: 1, the crystal will age and change frequency slowly over time and 2, temperature will affect the frequency. It is possible to stabilise the temperature in an oven but I have never seen a crystal oven for use with glass envelope crystals.![](../pics/abi0005a.jpg)
Seen side on the thin sheet of quartz is fixed to the connections at one point only on each side.![](../pics/abi0005b.jpg)
The rear view with the quartz at a slight angle - possibly this has been knocked at some time.The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 60 mm tall.Reference: Observation. |
Updated February 11, 2013.
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